O The letter O is the fifteenth letter in the Latin alphabet. Its name in English language is o .
	O'Neill O'Neill is a common surname of Ireland origin. Its original Irish language form is Nill or Ua Nill, meaning 'grandson of Niall'. In past usage, it refers to an Irish kinship group based in Ulster descended from a family, the U Nill from which a number of High King of Ireland sprang in medieval times.
	O. Henry O. Henry was the pen name of United States writer William Sydney Porter , whose clever use of twist endings in his stories popularized the term "O. Henry Ending". His middle name at birth was Sidney, not Sydney; he later changed the spelling of his middle name when he first began writing as a journalist in the 1880s.
	Oahu Oahu , the "Gathering Place", is the third largest of the Hawaiian Islands and most populous island in the State of Hawaii. Including small close-in offshore islands such as Ford Island and the islands in Kaneohe Bay and off the eastern coast, it has a total land area of 596.66 mile .
	Oak The term oak can be used as part of the common name of any of several hundred species of trees and shrubs in the genus Quercus, and some related genera, notably Cyclobalanopsis and Lithocarpus. The genus is native to the northern hemisphere, and includes deciduous and evergreen species extending from cold latitudes to tropical Asia and the Americas.
	Oak Fern Oak Fern is a non-flowering plant of the family Polypodiaceae. Common in the Canada forests, it is also found in Scotland and Scandinavia.
	Oak leaf cluster An oak leaf cluster or oakleaves is a common device which is placed on Military of the United States awards and decorations to denote those who have received more than one bestowal of a particular decoration. The number of oak leaf clusters typically indicates the second and subsequent award of the decoration.
	Oar An oar is an implement used for water-borne propulsion. Oars have a flat Blade at one end. The oarsmen grasp the oar at the other end. What distinguishes oars from paddles is that paddles are held by the paddler, and are not connected with the vessel. Oars generally are fastened to the vessel.
	Oarfish Oarfish are large, greatly elongated, pelagic Lampriform fish comprising the small family Regalecidae. Found in all temperate to tropical oceans yet rarely seen, the oarfish family contains four species in two genus. One of these, the king of herrings, is listed in the Guinness Book of World Records as the longest bony fish alive, at up to 11 metres in length.
	OAS OAS may stand for: * Old Age Security * Oracle Application Server * Oral Allergy Syndrome * Organisation arme secrte * Organization of American States * Organization of African States * Office Automation Systems * Option Adjusted Spread Oas, Albay is a Philippine municipality in the Philippines.
	Oasis In geography, an oasis is an isolated area of vegetation in a desert, typically surrounding a spring or similar water source. The location of oases has been of critical importance for trade and transportation routes in desert areas. Caravans must travel via oases in order that supplies of water and food can be replenished.
	Oast house An oast house is an example of vernacular architecture in England, especially Kent and Sussex. They are farm buildings used for drying hops to prepare them for the brewing process. They consist of three or four storeys on which the hops were spread out to be dried by hot air from a wood or charcoal-fired kiln at the bottom.
	Oat The Oat is a species of Cereal, and the seeds of this plant. They are used for food for human and as fodder for animals, especially poultry and horses. Oat straw is used as animal bedding and sometimes as animal feed. Oats are often served as a porridge made from crushed or rolled oats, oatmeal, and are also baked into cookies together with wheat flour.
	Oatcake An oatcake is a type of cracker or pancake, made from oatmeal, and sometimes flour as well. Oatcakes are cooked on a griddle. Oatcakes may be more familiar to Americans in the form of their cousin, the Johnnycake, made of cornmeal, often cooked on a board or shovel, even stones, just as Scots in the past.
	Oatmeal Oatmeal is a product made by processing oats. In North America, oatmeal means any crushed oats, rolled oats, or cut oats used in recipes such as oatmeal cookies. The porridge made from this is also called oatmeal or oatmeal cereal. However in other parts of the English-speaking world, oatmeal means coarsely ground oats.
	Oaxaca The Free and Sovereign State of Oaxaca or simply Oaxaca w?'h?k? is one of the 31 Mexican state of Mexico, is in the southern part of Mexico, west of the Isthmus of Tehuantepec. Oaxaca borders the states of Guerrero to the west, Puebla to the northwest, Veracruz to the north, and Chiapas to the east.
	Ob River Ob River , also Obi, is a river in West Siberia, Russia, the country's fourth longest. It is known to the Ostiaks as the As, Yag, Kolta and Yema; to the Samoyedes as the Kolta or Kuay; and to the Siberian Tatars as the Omar or Umar. It is formed eight miles southwest of Biysk in Altai Krai, by the confluence of the Biya River and the Katun River.
	Obelisk An obelisk is a tall, thin, four-sided, tapering monument which ends in a pyramidal top. Ancient obelisks were made of a single piece of stone. The term stela is generally used for other monumental standing inscription sculpted stones not of classic obelisk form.
	Obesity Obesity is a condition in which the natural energy reserve, stored in the adipose tissue of humans and mammals, is increased to a point where it is a risk factor for certain health conditions or increased mortality. Obesity develops from the interaction of individual biology and the environment.
	Obituary An obituary is a notice of the death of a person, usually published in a newspaper, written or commissioned by the newspaper, and usually including a short biography. It is similar to a funeral notice, which is also published on the obituary page. A funeral notice is a paid advertisement written by family members, placed in the newspaper by the funeral home.
	Oblate An oblate spheroid is a rotational symmetry ellipsoid having a polar axis shorter than the diameter of the equatorial circle whose plane bisects it. It can be formed by rotating an ellipse about its minor axis, forming an equator with the end points of the major axis.
	Obliterate Obliterate is a grindcore band from Košice. Founded in 1992, as one of the first band of this genre in Slovakia.
	Obliterator Obliterator is a side-scrolling arcade adventure computer game published by Psygnosis in 1988. The game was programmed by David H. Lawson and its graphics were made by Garvan Corbett and Jim Ray Bowers. The game begins when the main character Drak is teleported into the alien spaceship that is approaching the earth.
	Oblivious Oblivious was a comedy game show that aired on Spike TV off and on between 2002 and 2004. The host would ask unsuspecting people trivia questions, while playing some sort of role. It was also aired on Challenge in the UK and Republic of Ireland and still airs on The Comedy Channel in Australia and on Spike TV.
	Oboe The oboe is a double reed musical instrument of the woodwind family. The English word "oboe" comes from the Italian version of hautbois, the name of the instrument in French ; the Italian name displaced the older English name "hautboy" or "hoboy" in the 18th century. A musician who plays the oboe is called an oboist.
	Oboe d'amore The oboe d'amore is a woodwind instrument. It is a member of the double reed family, very similar to the oboe. Slightly larger than the oboe, it has a less assertive and more tranquil and serene tone, and is considered the mezzo-soprano or alto of the oboe family. It is a transposing instrument, sounding a minor third lower than it is notated, i.e.
	Oboe da caccia The oboe da caccia is a musical instrument in the oboe family, Pitched a fifth below the oboe and used primarily in the Baroque music period of European classical music.
	Obolus The obolus is a Greece silver coin worth a sixth of a drachma. In Classical Athens it was subdivided into eight chalkoi. According to Plutarch, the Spartans had an iron obolus of four chalkoi. The obolus is also a measurement of weight. In ancient Greece it was defined as one sixth of a drachma, or about 0.5 gram.
	ObsCure ObsCure is a survival horror game that was developed by Hydravision and published by DreamCatcher Interactive for the PlayStation 2, Xbox, and Personal computer. It was released in North America on April 6, 2005 and October, 2004 in PAL regions.
	Obscure See also: ObsCure, a Computer and video games for the PlayStation 2, Xbox, and Microsoft Windows
	Observation tower An observation tower is a structure used to view events from a long distance and to create a full 360 degree range of vision. They are usually at least 20 meters tall and made from stone, iron, and wood. Many modern towers are also used as TV towers, restaurants, or churches. The towers first appeared in Germany at the end of the 18th century, and their numbers steadily increased, especially after the invention of the elevator.
	Observatory An observatory is a location used for observing terrestrial and/or celestial events. Astronomy, astrology, climatology, geology, meteorology, oceanography and volcanology are examples of disciplines for which observatories have been constructed. Historically, observatories were as simple as containing a sextant or Stonehenge .
	Obsidian Obsidian is a type of naturally occurring glass, produced by volcanoes when a felsic lava cools rapidly and freezes without sufficient time for crystal growth . It is commonly found within the margins of felsic lava flows, where cooling is more rapid. Because of the lack of crystal structure, obsidian blade edges can reach almost molecular thinness, leading to its ancient use as arrowheads, and its modern use as surgical scalpel blades.
	Obstetrics Obstetrics is the surgery specialty dealing with the care of a woman and her offspring during pregnancy, childbirth and the puerperium . Many obstetricians are also gynaecology; see Obstetrics and gynaecology.
	Obstreperous Category:Redirects to Wiktionary
	Obviously "Obviously" is the second single from the British Pop music band McFly. This is their second number 1 in the UK Top 40 singles. It topped the charts for one week. The CD features a cover version of The Beatles' Help!. The band recorded a special interview that could be heard on the Maxi and 12" Picture Disc where they responded to questions posted by their fans.
	Oca The oca or oka is the Quechua language word for a perennial plant grown in the central and southern Andes for its starchy edible tuber, used as a root vegetable. Its leaves and young shoots can be eaten as a green vegetable as well. Introduced to Europe in 1830 as a competitor to the potato and to New Zealand as early as 1860, it has become popular in that country under the name New Zealand yam and is now a common table vegetable.
	Ocarina The ocarina, and especially the popular variation sometimes called the sweet potato ocarina, is an ancient flute-like woodwind. It is one of the oldest musical instruments on Earth. It usually is made up of an oval-shaped enclosed space and four to thirteen finger holes, though there are some variations on the standard design.
	Occam's razor Occam's razor is a principle attributed to the 14th century English logician and Franciscan friar William of Ockham . Originally a tenet of the reductionism philosophy of nominalism, it is more often taken today as a heuristic maxim that advises economy, parsimony, or simplicity in theory#Science.
	Occultation An occultation is an Astronomy event that occurs when one celestial object is hidden by another celestial object that passes between it and the observer. Compared to astronomical Astronomical transits and eclipses, an occultation is said to occur when the nearer object appears larger and completely hides the more distant object.
	Occupational Hazard
	Occupational Safety and Health Administration The United States Occupational Safety and Health Administration is an agency of the United States Department of Labor. It was created by Congress of the United States under the Occupational Safety and Health Act, signed by President Richard M. Nixon, on December 29, 1970.
	Ocean Oceans cover almost three quarters of the surface of the Earth, and nearly half of the world's marine waters are over 3,000 meters deep. The area of the oceans is 361 million sq km. This global, interconnected body of sea water, called the World Ocean, is generally divided by the continents and archipelagos into the following bodies, from the largest to the smallest: the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Southern Ocean, and the Arctic Ocean.
	Ocean current An ocean current is any more or less permanent or continuous, directed movement of ocean water that flows in one of the Earth's oceans.
	Ocean liner An ocean liner is a passenger ship or passenger-cargo ship which tranports people and often freight from one port to another along regular trans-oceanic routes according to a schedule. The term also refers to vessels designed to engage in such trades, even if temporarily used for other purposes.
	Ocean sunfish The ocean sunfish, Mola mola, is the most massive bony fish in the world. It is a unique Pelagic zone fish, and specimens of ocean sunfish have been observed up to 3.3 m in length and weighing up to 2,300 kg. A member of the order Tetraodontiformes, the ocean sunfish has many derived characters and is the type species of its genus.
	Oceania Oceania is a geography, often geopolitics, region consisting of numerous lands—mostly islands but usually including Australia—in the Pacific Ocean and vicinity. The exact scope of Oceania is defined variously, with interpretations including Australia, New Zealand, New Guinea, and various islands of the Malay Archipelago.
	Oceanic whitetip shark The oceanic whitetip shark, Carcharhinus longimanus, is a large pelagic zone shark of tropical and warm temperate seas. It is named after its oceanic habitat, and the white tips of its fins. It is a stocky shark, most notable for its long, rounded fins. This aggressive but slow-moving fish dominates feeding frenzies, and has attacked more humans than all other shark species combined it is a notable danger to survivors of oceanic ship wrecks and downed aircraft.name="nova">Bass, A.J., J.D.
	Oceanography Oceanography , also called oceanology or marine science is the study of the Earth's oceans and seas. Oceanographers study a wide range of topics such as plate tectonics to ocean currents to marine organisms. These diverse topics reflect multiple disciplines that oceanographers blend to help us understand Earth's interdependencies: biology, chemistry, geology, meteorology, and physics.
	Oceanus Oceanus , was the ocean, which the Greeks and Romans believed to be an enormous river encircling the world. Strictly speaking, Okeanos was the ocean-stream at the Equator in which floated the habitable hemisphere . In Greek mythology, this world-ocean was personified as a Titan , a son of Uranus and Gaia .
	Ocellated Turkey The Ocellated Turkey is a large bird around 70-90 cm long and 3 kg to 4 kg weight. In the past, it has sometimes been treated in a genus of its own, as Agriocharis ocellata, but the differences between this species and Wild Turkey are too small to justify generic segregation.
	Ocellus An ocellus is a type of photoreceptor organ in animals. Also called "simple eyes", ocelli are miniature eyes capable just of sensing light but not of distinguishing its direction. Ocelli are found in many invertebrates. Insects in particular have two types of ocelli: dorsal ocelli are light-sensitive organs on the dorsal surface or on the top of the head.
	Ocelot The ocelot, also known as painted leopard or tigrillo, is a wild Felidae distributed over South America and Central America and Mexico, but has been reported as far north as Texas and in Trinidad, in the Caribbean. It can be up to 100 cm in length, plus 45 cm tail length, and weighs 10-15 kg.
	Ochna Ochna is a genus comprising 86 species of evergreen trees, shrubs and shrublets belonging to the family Ochnaceae. These species are native to tropical woodlands of Africa or Asia. Species of this genus are usually called Ochnas or Mickey-mouse plants, a name coming from the shape of the drupelet fruit.
	Ochnaceae The family Ochnaceae, or wild plane family, comprises mainly trees or shrubs, and more rarely herbaceous plants. Species of the Ochnaceae are found from subtropical to tropical regions. They are best represented in South America. The family has about 53 genera and 600 species.
	Ochre Ochre or Ocher is a color, usually described as golden-yellow or light yellow brown.
	Ochs Ochs refers to: * Adolph Ochs, Jewish reporter of Bavarian immigrant background ** Iphigene Bertha Ochs, daughter of Adolph, married Arthur Hays Sulzberger *** Arthur Ochs Sulzberger, son of Iphigene * Phil Ochs
	Ocimum Ocimum is a genus of about 35 species of aromatic annual and perrenial herbs and shrubs in the family Lamiaceae, native to the tropical and warm temperate regions of the Old World. Ocimum basilicum is a culinary herb of major importance; see that page for further details. Ocimum tenuiflorum is a sacred herb in India but is not much used for culinary purposes there.
	Ocotillo The ocotillo is a curious, and unique desert plant of the southwestern United States and northern Mexico. For much of the year, the plant appears to be an arrangement of large dead sticks, although closer examination reveals that the Plant stem are partly green. When rain comes, the plant quickly becomes lush with small ovate Leaf, which may remain for weeks or even months.
	Octagon In geometry, an octagon is a polygon that has eight sides. The most common use of octagons are for the shape of Stop sign.
	Octahedron An octahedron is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex. The regular octahedron is a special kind of triangular antiprism and of square bipyramid, and is dual to the cube.
	Octane Octane is an alkane with the chemical formula C8H18. It has 18 isomers. One of the isomers, 2,2,4-trimethylpentane or isooctane, is of major importance, as it has been selected as the 100 point on the octane rating scale, with heptane as the zero point.
	Octane rating The octane rating is a measure of the autoignition resistance of gasoline and other fuels used in spark plug internal combustion engines.
	October October is the tenth month of the year in the Gregorian Calendar and one of seven Gregorian months with the length of 31 days. October begins in western tropical astrology with the sun in the sign of Libra and ends in the sign of Scorpio . Astronomically speaking, the sun actually begins in the constellation of Virgo and ends in the constellation of Libra.
	October Revolution The October Revolution, also known as the Bolshevik Revolution or November Revolution, was the second phase of the Russian Revolution of 1917, the first having been instigated by the events around the February Revolution. The October Revolution was led by Vladimir Lenin and the Bolsheviks with the Mensheviks, Left Socialist-Revolutionaries and Anarchy .
	Octopodidae Octopodidae is a family (biology) of octopuses containing the majority of known species.
	Octopus The octopus is a cephalopod of the order Octopoda that inhabits many diverse regions of the ocean, especially coral reefs. The term may also refer to only those creatures in the genus Octopus . In the larger sense, there are 289 different octopus species, which is over one-third the total number of cephalopod species.
	Octroi Octroi is a local tax collected on various articles brought into a district for consumption.
	Oculus fr:Oculus nl:Oculus pl:Oculus sv:Oculus
	Odalisque An odalisque was a female slavery or concubine in the Ottoman Empire Seraglio, tending to the harem of the Turkey sultan. The word appears in a French form, and originates from the Turkish language odalik, meaning "chambermaid", from oda, "chamber" or "room".