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Dugout
Dugout may refer to:* Dugout - underground shelter* Dugout - a synonym for logboat* Dugout - a marijuana container-Sports:* Dugout ** Also the name of the mascot for Little League Baseball* Dugout

Duisburg (Tervuren)
-History:On the first of January 1977 Duisburg became part of the municipality of Tervuren as part of the fusion of the Belgian municipalities. Prior to this it was an independent municipality.-Culture:

Duka
Duka is a village in Vas County, Hungary.-Famous people:The poet Judit Dukai Takách was born in Duka in 1795. Zádor György was born there in 1799.- External links :*

Duke
A duke or duchess is a member of the nobility, historically of highest rank below the monarch, and historically controlling a duchy

Duke (album)
Duke is the tenth studio album by British band Genesis, released in March 1980.-Overview:The release of Duke followed solo albums by Genesis members Tony Banks and Mike Rutherford .

Duke (disambiguation)
A Duke or Grand Duke is a title of nobility for aristocrats of very high rank.Duke or Dukes may also refer to:-Persons:As a surname:* See Duke and Dukes As a nickname, Duke may refer to:

Dukedom
Dukedom may refer to:* Duchy, the territory ruled by a duke* the office of a duke-Places:United States* Dukedom, Kentucky and Tennessee, an unincorporated community in Graves County, Kentucky and Weakley County, Tennessee-Computer games:

Dukes
-Albums:-EPs:-Singles:

DUL


Dul


Dulce
The term Dulce may refer to:-Places:*Dulce Base, a supposed American secret military facility*Dulce, New Mexico*Dulce River *Dulce River, a river in Guatemala-People:* Dulce, a Mexican singer

Dulcify
Dulcify was an New Zealand-bred Thoroughbred racehorse. His British-bred sire was the 1970 Irish 2,000 Guineas winner, Decies, a grandson of Pharis, the very important French sire whom Thoroughbred Heritage says is considered one of the greatest French-bred runners of the century

Dulcimer
Dulcimer may refer to two types of musical instruments:* Appalachian dulcimer, a fretted, plucked musical instrument which is also referred to as a "mountain dulcimer", "lap dulcimer", "hog fiddle", "fretted dulcimer" or simply "dulcimer"

Dull
Dull may refer to:* Boring* Dull, Perth and Kinross, Scotland, United Kingdom* Dull Gret, a figure of Flemish folklorePeople with the surname Dull:* Jack Dull , professor at the University of Washington

Dully
Dully is a municipality in the district of Nyon in the canton of Vaud in Switzerland.-Geography:Dully has an area, , of . Of this area, or 53.0% is used for agricultural purposes, while or 15.1% is forested. Of the rest of the land, or 28.9% is settled .Of the built up area, housing and buildings made up 20.5% and transportation infrastructure made up 7.2%

Dulse
Palmaria palmata Kuntze, also called dulse, dillisk, dilsk, red dulse, sea lettuce flakes or creathnach, is a red alga previously referred to as Rhodymenia palmata Greville. It grows on the northern coasts of the Atlantic and Pacific oceans. It is a well-known snack food

Dum
Dum, DUM or Dhum may refer to:* Dum, an Arabic common name for Ziziphus zizyphus , a plant* Dum , a Bollywood action film directed by E.Nivas

Dum (film)
Dum is a South Indian Tamil blockbuster film released in 2003 starring Simbu and Rakshitha. This film is a remake of the Kannada movie Appu starring Puneet Rajkumar, which was also remade in Telugu in 2002 as the film Idiot starring Raviteja and Rakshitha.-Plot:Simbu is the son of a police constable

Dum Dum (Ekatarina Velika album)
Dum Dum is the sixth studio album by the Serbian rock band Ekatarina Velika, released in 1991. Srdjan "Žika" Todorović was here replaced by Marko Milivojević , who remained the band's drummer till the end

Duma (software)
Detect Unintended Memory Access is a memory debugger. It consists of a library which programmers can link into their code to override the C standard library and C++ memory management functions

Dumb
Dumb may refer to:* Muteness, the condition of being unwilling or unable to speak* Stupidity, a lack of intelligence* "Dumb" , a 1993 song by the band Nirvana from the album In Utero* "Dumb" , a 2004 song by the group The 411

Dumb (The 411 song)
"Dumb" is a single by British R'n B group The 411. Released in August 2004, it was included on the group's debut album Between the Sheets. To date, "Dumb" is their highest-charting single reaching number three in the UK Top 75 losing the number one position to Natasha Bedingfield's "These Words" but beating competition from Sugababes "Caught in a Moment" and Maroon 5's "Harder to

Dumbo (disambiguation)
Dumbo is an animated film.Dumbo may also refer to:* Dumbo , ocean search and rescue missions by long-range aircraft* Dumbo, Brooklyn, a neighborhood in Brooklyn

Dumbwaiter
Dumbwaiter may refer to:* Dumbwaiter , a freight elevator or lift between building floors* Lazy Susan, a small rotating table or set of cabinets used for serving food* An auxiliary serving table or cart.

Dummy
Dummy may refer to:*Military dummy:**dummy round—a cartridge that is inert, i.e. contains neither primer nor gunpowder**decoy—fake military equipment intended to deceive the enemy

Dump
Dump generally refers to a place for disposal of domestic waste. See articles at midden and landfill.-Other uses:The word has other uses alone or in combination and may refer to:* Dump , a Unix program for backing up file systems

Dump (band)
Dump is a vehicle for releasing the four-track home recordings of Yo La Tengo bassist James McNew. His recordings occasionally feature guest performers such as Sue Garner and Fontaine Toups

Dumper
A dumper is a vehicle designed for carrying bulk material, often on building sites. Dumpers are distinguished from dump trucks by configuration: a dumper is usually an open 4-wheeled vehicle with the load skip in front of the driver, while a dump truck has its cab in front of the load. The skip can tip to dump the load; this is where the name "dumper" comes from

Dumping
Dumping may refer to a subject......in computing:*Recording the contents of memory after application or operating system failure, or by operator request, in a core dump for use in subsequent problem analysis.*Recording a file or medium as a backup.

Dumpster
A dumpster is a large steel waste receptacle designed to be emptied into garbage trucks. The word is a genericized trademark of Dumpster, a American brand name for a type of mobile garbage bin

Dumpster
A dumpster is a large steel waste receptacle designed to be emptied into garbage trucks. The word is a genericized trademark of Dumpster, a American brand name for a type of mobile garbage bin

Dumpster (term)
A dumpster is a large steel waste receptacle designed to be emptied into garbage trucks. The word is a genericized trademark of Dumpster, a American brand name for a type of mobile garbage bin

Dun
Dun is now used both as a generic term for a fort and also for a specific variety of Atlantic roundhouse

Dunaliellaceae
In taxonomy, the Dunaliellaceae are a family of algae, specifically of the Chlamydomonadales.-Scientific databases:

Duncan
Duncan, originally a Scottish name, may also refer to:- Fiction :* King Duncan, a character in William Shakespeare's play Macbeth* Duncan , a locomotive character in The Railway Series children's books by the Rev. W

Duncan (given name)
Duncan is a given name. It is an Anglicised form of the Gaelic Donnchadh. The final letter n in the Anglicised Duncan seems to be a result of confusion in the Latin form of the name—Duncanus—with the Gaelic word ceann, meaning "head"

Duncan (surname)
Duncan is a surname. For the etymology of the surname Duncan this web page cites: Dictionary of American Family Names. Another opinion is that the Gaelic Donnchadh is composed of the elements donn, meaning "brown"; and chadh, meaning "chief" or "noble"

Duncan (Thomas the Tank Engine)
Duncan is a fictional narrow gauge steam locomotive from The Railway Series children's books by the Rev. W. Awdry, and the spin-off TV series Thomas and Friends. Duncan lives and works on the Skarloey Railway on the Island of Sodor. Duncan is a stubborn engine that likes to complain that he is overworked

Duncan Sheik
Duncan Scott Sheik is an American singer-songwriter and composer. Sheik initially found success as a singer, most notably for his 1996 debut single "Barely Breathing". He later expanded his work to include compositions for motion pictures and the Broadway stage, leading him to involvement in the multiple award-winning musical Spring Awakening

Dunce
A dunce is a person incapable of learning.The word is derived from the name of the great Scholastic theologian and philosopher John Duns Scotus, also referred to as Doctor Subtillis, or "Subtle Doctor", whose works on logic, theology and philosophy were accepted textbooks in the universities from the 14th century

Dundee (ship)
The Dundee was a ship wrecked in 1808 off the coast of New South Wales, Australia.The Dundee left Sydney for Fiji to obtain Sandalwood to take to China in August 1808. As it sailed past the entrance to the Hunter River the ship encountered a heavy gale and foundered on the sandbars at the mouth of the river. Shortly after the ship broke up drowning two Lascars

Dune
In physical geography, a dune is a hill of sand built by wind. Dunes occur in different forms and sizes, formed by interaction with the wind. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind

Düne
Düne is the only island in the German North Sea Coast Area that belongs to the Archipelago of Heligoland.-Geography:

Dune (software)
DUNE is a modular C++ library for the solution of partial differential equations using grid-based methods.The DUNE library is divided into modules

Dune Buggy (song)
"Dune Buggy" is the name of the seventh single by the post-grunge band The Presidents of the United States of America. "Dune Buggy" was the last single released from their highly successful debut album.

Dunedin (ship)
The Dunedin was the first ship to complete a truly successful transport of refrigerated meat. In its capacity, it helped set the stage for New Zealand's success as a major provider of agricultural exports, notwithstanding its extreme remoteness from most markets.-Ship origins:The 1,320-ton, Dunedin was built by Robert Duncan and Co at Port Glasgow, Scotland, in

Dung
Dung may refer to:* Dung, animal feces* Dung, Doubs, a commune in the Doubs department in the Franche-Comté region in eastern France* Mundungus Fletcher or "Dung", a character in the Harry Potter novels* Dung beetle

Dungaree
Dungaree may refer to:*Dungarees, jeans made from denim or, in the United Kingdom, Bib and brace overalls*Dungarees, nickname of the cotton working and tropical field uniform, equivalent to US Army Fatigues, used by the United States Marines during World War II, for*Dungaree, a Hindu goddess living on a Dungar, a moderate size hill or a small mountain*Dungaree, a type of onion

Dungen (album)
Dungen is the self-titled debut album of Swedish psychedelic rock group Dungen.It was originally released in 2001 by Subliminal Sounds on a limited vinyl edition of 500 copies

Dungeon
A dungeon is a room or cell in which prisoners are held, especially underground. Dungeons are generally associated with medieval castles, though their association with torture probably belongs more to the Renaissance period

Dungeon
A dungeon is a room or cell in which prisoners are held, especially underground. Dungeons are generally associated with medieval castles, though their association with torture probably belongs more to the Renaissance period

Dungeons & Dragons (album)
Dungeons & Dragons is a studio album by Midnight Syndicate, released August 12, 2003 by Entity Productions. The album is designed as a soundtrack to the role-playing game Dungeons & Dragons and was produced by Midnight Syndicate at the request of Wizards of the Coast, the company which owns the rights to the Dungeons & Dragons franchise

Dunk
Dunk or Dunking may refer to:* Slam dunk, type of basketball shot that is performed when a player jumps in the air and manually powers the ball downward through the basket with one or both hands over the rim

Dunk (elephant)
Dunk , a tuskless, male Asian Elephant possibly from Ceylon, was the first elephant to reside at the National Zoo in Washington, D.C. He was gifted to the National Zoo on April 30, 1891 by James E

Dunker
A Dunker is a breed of dog also known as the Norwegian Hound. It was bred by Wilhelm Dunker by crossing a Russian Harlequin Hound with dependable Norwegian scent hounds.-Appearance:Head: Is Elongated, but not wedge shaped and a moderate stop.

Dunkirk (TV series)
Dunkirk is a 2004 BBC television docudrama about the Battle of Dunkirk and the Dunkirk evacuation in World War II.-Awards:*BAFTA Awards 2005**Won: Huw Wheldon Award for Specialist Factual: Robert Warr & Alex Holmes

Dunlin
The Dunlin, Calidris alpina, is a small wader, sometimes separated with the other "stints" in Erolia. It is a circumpolar breeder in Arctic or subarctic regions. Birds that breed in northern Europe and Asia are long-distance migrants, wintering south to Africa, southeast Asia and the Middle East

Dunny (disambiguation)
Dunny is Australian slang for a toilet.Dunny may also mean:* Dunny , a vinyl toy by Kidrobot* Dunny Goode , head football coach for Eastern New Mexico University

Dunny (toy)
A Dunny is a type of vinyl designer toy created by Paul Budnitz and Tristan Eaton, and produced by Kidrobot from 2004.The toy is based on a rabbit figure with distinctive tubular ears. The origin of the name Dunny came from a combination of street slang and one of the early "Devil Bunny" prototypes.The Dunny is sold in three sizes - 3", 8" and 20"

Dunton (LIRR station)
Dunton was a ground-level station on the Long Island Rail Road's Main Line, Montauk Branch, and Atlantic Branch in Dunton, Queens, New York City, United States

Duo
-Arts:*Duet , a musical piece performed by two people*Duo, a musical ensemble composed of two musicians*Comedy duo, also known as a double act*Duo , 2008*Duo , 1991

DUO
DUO may refer to:* Dark Universe Observatory a planned space observatory.* Kalirin a member of Dbl family of protein.*Divine United Organization, an offshoot of the Divine Light Mission

Duo (Richard Marx and Matt Scannell album)
Duo is a compilation album by Richard Marx and, Vertical Horizon vocalist, Matt Scannell. The disc debuted on May 12, 2008, exclusively through RichardMarx.com and is now available for sale at their concerts together as well. Marx and Scannell exhibit both of their acclaimed works. Marx remade a version of "Always On Your Mind," for his 2008 album Sundown

Duodecimal
The duodecimal system is a positional notation numeral system using twelve as its base. In this system, the number ten may be written as 'A', 'T' or 'X', and the number eleven as 'B' or 'E'

Hursid Pasha
Hurşid Ahmed Pasha was an Ottoman General and Grand Vizier during the early 19th century. He was of Georgian descent.- Early life :

Hurst Castle
Hurst Castle on the south coast of England is one of Henry VIII's Device Forts, built at the end of a long shingle barrier beach at the west end of the Solent to guard the approaches to Southampton. Hurst Castle was sited at the narrow entrance to the Solent where the ebb and flow of the tides creates strong currents, putting would-be invaders at its mercy

Hurst Reservoir
Hurst Reservoir is a reservoir near Glossop, north Derbyshire. In 1837, 50 local millowners and gentleman, known as the "Glossop Commissioners", obtained an Act of Parliament to construct the Glossop Reservoirs. Hurst Reservoir was on the Hurst Brook and Mossy Lea Reservoir was to take water from the Shelf Brook

Hurva Synagogue
The Hurva Synagogue, , also known as Hurvat Rabbi Yehudah he-Hasid , is a historic synagogue located in the Jewish Quarter of the Old City of Jerusalem.

Husband E. Kimmel
Husband Edward Kimmel was a four-star admiral in the United States Navy. He served as Commander-in-chief, U.S. Pacific Fleet at the time of the Japanese attack on Pearl Harbor. Because of the attack, he was removed from office and was reduced to his permanent two-star rank of rear admiral

Hussein bin Ali, Sharif of Mecca
Sayyid Hussein bin Ali, GCB was the Sharif of Mecca, and Emir of Mecca from 1908 until 1917, when he proclaimed himself King of Hejaz, which received international recognition. He initiated the Arab Revolt in 1916 against the increasingly nationalistic Ottoman Empire during the course of the First World War

Hutchinson River Parkway
The Hutchinson River Parkway is a north–south parkway in southern New York, United States. It extends for from the massive Bruckner Interchange in the Throgs Neck section of the Bronx to the New York – Connecticut state line at Rye Brook

Huthwaite
Huthwaite is a small village in Nottinghamshire, England, located to the west of Mansfield, close to the Derbyshire border. Before 1907 the village was known as Hucknall-under-Huthwaite and also Dirty Hucknall.-Derivation of Name:

Hutschenreuther
Hutschenreuther is the name of the family that established the production of porcelain in Northern Bavaria, in 1814. Hutschenreuther was a trend-setter and enabled Germany to gain an excellent reputation in the European porcelain industry

Hutsonville, Illinois
Hutsonville is a village in Crawford County, Illinois, United States. The population was 568 at the 2000 census.-Geography:Hutsonville is located at .

Hutsuls
Hutsuls are an ethno-cultural group of Ukrainian highlanders who for centuries have inhabited the Carpathian mountains, mainly in Ukraine, the northern extremity of Romania .-Etymology:

Huygens-Fresnel principle
The Huygens–Fresnel principle is a method of analysis applied to problems of wave propagation both in the far-field limit and in near-field diffraction.-History:

HVAC
HVAC refers to technology of indoor or automotive environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer

Hwa Chong International
Hwa Chong International School , a co-educational secondary international school in Singapore, is an affiliated school of Hwa Chong Institution catering to both local and foreign students.-Overview:

Hwacha
Hwacha or Hwach'a is the world's first multiple rocket launcher developed and used in Joseon Korea. It had the ability to fire up to 100 steel-tipped rockets, or 200 Singijeon flaming arrow projectiles from a range of 500 yards in multiple salvos

Hwang Jang Lee
Hwang Jang Lee is a Korean martial artist and actor. Hwang is perhaps best known as Sheng Kuan in 1978 film Snake in the Eagle's Shadow and Wong Chin in 1981 film Hitman in the Hand of Buddha. Variations of his name are often written as Wong Cheng Lee or Wong Cheng Li, in their Cantonese-Chinese equivalents

Hy-Vee
Hy-Vee is an employee-owned chain of supermarkets located in the Midwestern United States. Over 100 of its supermarkets are located in Iowa, with additional stores in Illinois, Kansas, Minnesota, Missouri, Nebraska, South Dakota and now Madison, Wisconsin

Hyacinth bean
Lablab purpureus Lablab purpureus Lablab purpureus (syn. Dolichos lablab L., Dolichos purpureus L., L. niger Medikus, L. lablab (L.) Lyons, Vigna aristata Piper, and L

Hyacinth Macaw
The Hyacinth Macaw , or Hyacinthine Macaw, is a parrot native to central and eastern South America. With a length of about 100 cm it is longer than any other species of parrot

Hyaenodon
Hyaenodon is an extinct genus of Hyaenodonts, a group of carnivorous creodonts of the family Hyaenodontidae endemic to all continents except South America, Australia and Antarctica, living from 42—15.9 mya, existing for approximately .-Morphology:Some species of this genus were amongst the largest terrestrial carnivorous mammals of their time; others were

Hyatt
Hyatt Hotels Corporation , is an international operator of hotels.Hyatt Center is the headquarters for Hyatt corporation

Hyatt Regency Crown Center
The Sheraton Kansas City Hotel at Crown Center is a , 45-story hotel in the Crown Center complex in Kansas City, Missouri.The hotel opened on July 1, 1980 as the Hyatt Regency Kansas City and was Missouri's tallest building from 1980 to 1986

Hybla Valley, Virginia
Hybla Valley is a census-designated place in Fairfax County, Virginia, United States south of Alexandria, Virginia. Nearby CDPs include Groveton, Virginia , Belle Haven, Fairfax County, Virginia , Fort Hunt, Virginia and Mount Vernon, Virginia

Hybrid bicycle
A hybrid bicycle is a bicycle designed for general-purpose utility and commuting on a wide variety of surfaces, including paved and unpaved roads, paths and trails

Hybrot
A hybrot is a cybernetic organism in the form of a robot controlled by a computer consisting of both electronic and biological elements. The biological elements are typically rat neurons connected to a computer chip.

Hyde Park, Chicago
Hyde Park, located on the South Side of the City of Chicago, in Cook County, Illinois, United States and seven miles south of the Chicago Loop, is a Chicago neighborhood and one of 77 Chicago community areas. It is home to the University of Chicago, the Hyde Park Art Center, the Museum of Science and Industry, the Oriental Institute and the Renaissance Society

Hyde Park, Leeds
Hyde Park is an inner-city area of north-west Leeds, West Yorkshire, England, situated between the University of Leeds and Headingley.It is mainly in the Hyde Park & Woodhouse ward, though some areas of what is often considered to be Hyde Park lie within the Headingley Ward . The boundary is roughly Queens Road

Hyde Park, London
Hyde Park is one of the largest parks in central London, United Kingdom, and one of the Royal Parks of London, famous for its Speakers' Corner.The park is divided in two by the Serpentine

Hydra (genus)
Hydra is a genus of simple fresh-water animal possessing radial symmetry. Hydras are predatory animals belonging to the phylum Cnidaria and the class Hydrozoa. They can be found in most unpolluted fresh-water ponds, lakes, and streams in the temperate and tropical regions and can be found by gently sweeping a collecting net through weedy areas

Hydra (moon)
Hydra is the second outermost known natural satellite of Pluto. It was discovered along with Nix in June 2005, and is to be visited along with Pluto by the New Horizons mission in July 2015.- Discovery :

Hydrangea quercifolia
Hydrangea quercifolia, commonly known by its translation Oakleaf hydrangea, is a species of hydrangea native to the Southeastern United States, in woodland habitats from North Carolina west to Tennessee, and south to Florida and Louisiana.

Hydraulic conductivity
Hydraulic conductivity, symbolically represented as K, is a property of vascular plants, soil or rock, that describes the ease with which water can move through pore spaces or fractures. It depends on the intrinsic permeability of the material and on the degree of saturation

Hydraulic motor
A hydraulic motor is a mechanical actuator that converts hydraulic pressure and flow into torque and angular displacement . The hydraulic motor is the rotary counterpart of the hydraulic cylinder.

Hydraulic Rescue Tools
Hydraulic rescue tools are used by emergency rescue personnel to assist vehicle extrication of crash victims, as well as other rescues from small spaces. These tools include cutters, spreaders, door busters and rams

Hydraulics
Hydraulics is a topic in applied science and engineering dealing with the mechanical properties of liquids. Fluid mechanics provides the theoretical foundation for hydraulics, which focuses on the engineering uses of fluid properties. In fluid power, hydraulics is used for the generation, control, and transmission of power by the use of pressurized liquids

Hydraulophone
A hydraulophone is a tonal acoustic musical instrument played by direct physical contact with water where sound is generated or affected hydraulically. Typically sound is produced by the same hydraulic fluid in contact with the player's fingers

Hydrazine
Hydrazine is an inorganic compound with the formula N2H4. It is a colourless flammable liquid with an ammonia-like odor. Hydrazine is highly toxic and dangerously unstable unless handled in solution. Approximately 260,000 tons are manufactured annually

Hydrazoic acid
Hydrazoic acid, also known as hydrogen azide or azoimide, is a colorless, volatile, and extremely explosive liquid at room temperature and pressure. It is a compound of nitrogen and hydrogen, having chemical formula HN3. It was first isolated in 1890 by Theodor Curtius

Hydrilla
Hydrilla is an aquatic plant genus, usually treated as containing just one species, Hydrilla verticillata, though some botanists divide it into several species. Synonyms include H. asiatica, H. japonica, H. lithuanica, and H. ovalifolica

Hydroboration-oxidation reaction
In organic chemistry, the hydroboration–oxidation reaction is a two-step organic reaction that converts an alkene into a neutral alcohol by the net addition of water across the double bond. The hydrogen and hydroxyl group are added in a syn addition leading to cis stereochemistry

Hydrobromic acid
Hydrobromic acid is a strong acid formed by dissolving the diatomic molecule hydrogen bromide in water. "Constant boiling" hydrobromic acid is an aqueous solution that distills at 124.3 °C and contains 47.6% HBr by weight, which is 8.89 mol/L. Hydrobromic acid has a pKa of −9, making it a stronger acid than hydrochloric acid, but not as strong as hydroiodic acid

Hydrocarbon
In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons from which one hydrogen atom has been removed are functional groups, called hydrocarbyls.

Hydrochloric acid
Hydrochloric acid is a solution of hydrogen chloride in water, that is a highly corrosive, strong mineral acid with many industrial uses. It is found naturally in gastric acid.

Hydrochlorothiazide
Hydrochlorothiazide, abbreviated HCTZ, HCT, or HZT, is a first-line diuretic drug of the thiazide class that acts by inhibiting the kidneys' ability to retain water. This reduces the volume of the blood, decreasing blood return to the heart and thus cardiac output and, by other mechanisms, is believed to lower peripheral vascular resistance

Hydroelectricity
Hydroelectricity is the term referring to electricity generated by hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy

Hydrofluoric acid
Hydrofluoric acid is a solution of hydrogen fluoride in water. It is a valued source of fluorine and is the precursor to numerous pharmaceuticals such as fluoxetine and diverse materials such as PTFE .

Hydrogen
Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly composed of hydrogen in its plasma state

Hydrogen bond
A hydrogen bond is the attractive interaction of a hydrogen atom with an electronegative atom, such as nitrogen, oxygen or fluorine, that comes from another molecule or chemical group. The hydrogen must be covalently bonded to another electronegative atom to create the bond

Hydrogen chloride
The compound hydrogen chloride has the formula HCl. At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric humidity. Hydrogen chloride gas and hydrochloric acid are important in technology and industry

Hydrogen fluoride
Hydrogen fluoride is a chemical compound with the formula HF. This colorless gas is the principal industrial source of fluorine, often in the aqueous form as hydrofluoric acid, and thus is the precursor to many important compounds including pharmaceuticals and polymers . HF is widely used in the petrochemical industry and is a component of many superacids

Hydrogen halide
Hydrogen halides are acids resulting from the chemical reaction of hydrogen with one of the halogen elements , which are found in Group 17 of the periodic table. Astatine is not included in the list because it is very rare, unstable and not found as the acid in substantial quantities

Hydrogen iodide
Hydrogen iodide is a diatomic molecule. Aqueous solutions of HI are known as iohydroic acid or hydroiodic acid, a strong acid. Gas and aqueous solution are interconvertible

Hydrogen ion
Hydrogen ion is recommended by IUPAC as a general term for all ions of hydrogen and its isotopes.Depending on the charge of the ion, two different classes can be distinguished: positively charged ions and negatively charged ions.

Hydrogen peroxide
Hydrogen peroxide is the simplest peroxide and an oxidizer. Hydrogen peroxide is a clear liquid, slightly more viscous than water. In dilute solution, it appears colorless. With its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent

Hydrogen spectral series
The emission spectrum of atomic hydrogen is divided into a number of spectral series, with wavelengths given by the Rydberg formula. These observed spectral lines are due to electrons moving between energy levels in the atom. The spectral series are important in astronomy for detecting the presence of hydrogen and calculating red shifts

Hydrographic survey
Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore oil exploration/drilling and related disciplines. Strong emphasis is placed on soundings, shorelines, tides, currents, sea floor and submerged obstructions that relate to the previously mentioned activities

Hydrology
Hydrology is the study of the movement, distribution, and quality of water on Earth and other planets, including the hydrologic cycle, water resources and environmental watershed sustainability

Hydrometer
A hydrometer is an instrument used to measure the specific gravity of liquids; that is, the ratio of the density of the liquid to the density of water.

Hydromorphone
Hydromorphone, a more common synonym for dihydromorphinone, commonly a hydrochloride is a very potent centrally-acting analgesic drug of the opioid class. It is a derivative of morphine, to be specific, a hydrogenated ketone thereof and, therefore, a semi-synthetic drug

Hydronium
In chemistry, a hydronium ion is the cation , a type of oxonium ion produced by protonation of water. This cation is often used to represent the nature of the proton in aqueous solution, where the proton is highly solvated

Hydrophiinae
Hydrophiinae, also known as sea snakes, is a group of venomous elapid snakes that inhabit marine environments for most or all of their lives. Though they evolved from terrestrial ancestors, most are extensively adapted to a fully aquatic life and are unable to move on land, except for the genus Laticauda, which retain ancestral characteristics, allowing limited land movement

Hydrophone
A hydrophone is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates electricity when subjected to a pressure change

Hydroplane
A hydroplane is a fast motorboat, where the hull shape is such that at speed, the weight of the boat is supported by planing forces, rather than simple buoyancy.

Hydroponics
Hydroponics is a method of growing plants using mineral nutrient solutions, in water, without soil. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite, gravel, mineral wool, or coconut husk.Researchers discovered in the 18th century that plants absorb essential mineral nutrients as inorganic ions in water

Hydropower
Hydropower, hydraulic power, hydrokinetic power or water power is power that is derived from the force or energy of falling water, which may be harnessed for useful purposes. Since ancient times, hydropower has been used for irrigation and the operation of various mechanical devices, such as watermills, sawmills, textile mills, dock cranes, and domestic lifts

Hydroseeding
Hydroseeding is a planting process which utilizes a slurry of seed and mulch. The slurry is transported in a tank, either truck- or trailer-mounted and sprayed over prepared ground. Helicopters have been used to cover larger areas

Hydrosphere
A hydrosphere in physical geography describes the combined mass of water found on, under, and over the surface of a planet.

Hydrostatic skeleton
A hydrostatic skeleton or hydroskeleton is a structure found in many cold-blooded organisms and soft-bodied animals consisting of a fluid-filled cavity, the coelom, surrounded by muscles. The pressure of the fluid and action of the surrounding circular and longitudinal muscles are used to change an organism's shape and produce movement, such as burrowing or swimming

Hydrostatic test
A hydrostatic test is a way in which leaks can be found in pressure vessels such as pipelines and plumbing. The test involves placing water, which is often dyed for visibility, in the pipe or vessel at the required pressure to ensure that it will not leak or be damaged. It is the most common method employed for testing pipes and vessels