Repeater A repeater is an Electronics device that receives a weak or low-level signal and retransmits it at a higher level or higher power, so that the signal can cover longer distances without degradation. The term "repeater" originated with telegraphy and referred to an electromechanical device used to regenerate telegraph signals.
	Replica The proper definition of replica is "a copy made by the person who made the original", though it is now commonly used to refer to any copy. Replicas are often used for historical purposes, such as being placed in a museum. Sometimes the original never existed. For example, Difference Engine No.
	Reporter A reporter is a type of journalist who researches and presents information in certain types of mass media. Reporters gather their information in a variety of ways, including tips, press releases, and witnessing an event. They perform research through interviews, public records, and other sources.
	Reptile Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane. Today they are represented by four surviving order : * Crocodilia : 23 species * Tuatara : 2 species * Squamata : approximately 7,600 species
	Republic In a broad definition, a republic is a state or country that is led by people whose political power is based on principles that are not beyond the control of the people of that state or country. Several definitions, including that of the 1911 Encyclopdia Britannica, stress the importance of autonomy and the rule of law as part of the requirements for a republic.
	Republic of China The Republic of China is a country in East Asia. Once the national government of all China, it lost control of mainland China to the People's Republic of China as a result of the Chinese Civil War in the late 1940's, and since then has only administered the List of islands of the Republic of China of Taiwan , the Pescadores Islands, Kinmen, and Matsu Islands.
	Republic of the Congo The Republic of the Congo, also known as Congo-Brazzaville, and Congo, is a former France colony of west-central Africa. Its borders are Gabon, Cameroon, Central African Republic, Democratic Republic of the Congo, Angola and the Gulf of Guinea.
	Republican River } The Republican River rises on the Great Plains of eastern Colorado in the United States. The two main tributaries, called the North and South forks, join at Benkelman, Nebraska. From there, the river flows generally eastward along the southern border of Nebraska before curving southward into Kansas.
	Repulsion Repulsion is a film made in 1965 directed by Roman Polaski. It is Polaski's first English language film, and was filmed in Britain. Cast includes Catherine Deneuve, Ian Hendry, John Fraser, Yvonne Furneaux, and a cameo appearance by Roman Polaski himself.
	Requiem shark The requiem sharks are members of the Carcharhinidae family that includes some of the best-known and most common types of sharks, such as the tiger shark, blue shark, bull shark, and milk shark. Family members have the usual carcharhiniform characteristics. The eyes are round, and the pectoral fins are completely behind the five gill slits.
	Reredos A reredos is a screen or decoration behind the altar in a church, usually depicting religious iconography or images. It can be made of stone, wood, metal, ivory, or a combination of materials. The images may be painted, carved, gilding, composed of mosaics, and/or embedded with niches for statues.
	Res Shareese Rene Ballard, better known as Res is a female R&B singer from Philadelphia, Pennsylvania. Her music is a mixture of soul music, hip hop music, House music and rock and roll. She released her debut album, How I Do, in 2001 featuring the first single "Golden Boys." In spite of the video's heavy rotation on VH1, the song was not a hit on radio.
	Resedaceae Resedaceae is a family of generally herbaceous dicotyledonous plants comprising some 70 species in six genera: *Caylusea *Ochradenus *Oligomeris *Randonia *Mignonette *Sesamoides The family includes Annual plant, biennials and perennials and is distributed in temperate to sub-tropical regions of the Europe, western Asia, the Middle East, North America, and South Africa.
	Reserpine Reserpine is an indole alkaloid antipsychotic and antihypertensive drug known to irreversibly bind to storage vesicles of neurotransmitters such as dopamine, norepinephrine, and serotonin. Reserpine depletion of monoamine neurotransmitters in the synapses is often used to bolster the theory that depletion of the neurotransmitters causes subsequent clinical depression in humans.
	Reset Reset may be: *Reset, a generic concept in the financial markets, meaning the determination and recording of a reference rate *Reset, a French-Canadian pop punk band that formed in 1995 in Quebec, Canada *Reset, Australian racehorse *"Reset," a song by Outkast from their 2003 album Speakerboxxx/The Love Below
	Resh Resh is the twentieth letter of many Semitic abjads, including Phoenician language, Aramaic language, Hebrew language and Arabic alphabet . Its sound value is one of a number of rhotic consonants: usually or but also or in Hebrew. In most Semitic abjads, the letter resh is quite similar to the letter dalet.
	Residential area A residential area is a type of land use where the predominant use is housing. In areas that are zoning residential, buildings may include single family housing, multiple family housing such as or mobile homes. Zoning for residential use may permit some services or work opportunities or may totally exclude business and industry.
	Resin Resin is a hydrocarbon secretion of many plants, particularly Pinophyta, valued for its chemical constituents and uses such as varnishes, adhesives, as an important source of raw materials for organic synthesis, or for incense and perfume. Fossilized resins are the source of amber.
	Resistance thermometer Resistance thermometers, also called resistance temperature detectors, are temperature sensors that exploit the predictable change in electrical resistance of some materials with changing temperature. As they are almost invariably made of platinum, they are often called platinum resistance thermometers.
	Resistor |- align = "center" | |width = "25"| | |- align = "center" | | | |- align = "center" | Resistor | | Variable Resistor |- align = "center" | |width = "25"| | |- align = "center" | | | |- align = "center" | Resistor | | Variable resistor A resistor is a two-terminal electricity or electronics component that resists an electric current by producing a voltage drop between its terminals in accordance with Ohm's law.
	Resorcinol Resorcinol is the 1,3-isomer of benzenediol. It is also known with a variety of other names, including: m-dihydroxybenzene, 1,3-benzenediol, 1,3-dihydroxybenzene, 3-hydroxyphenol, m-hydroquinone, m-benzenediol, and 3-hydroxycyclohexadien-1-one.
	Resort A resort is a place used for relaxation or recreation. As a result, people tend to seek out a resort for holidays or vacations. Generally, a resort is run by a single company, which attempts to provide for all or most of a vacationer's wants while staying there, such as food, drink, lodging, sports, entertainment, and shopping.
	Respirator For the mechanical device used to assist breathing, see ventilator. A respirator is a device designed to protect the wearer from inhaling harmful dusts, fumes, vapors, and/or gases. Respirators come in a wide range of types and sizes used by the military, private industry, and the public.
	Respiratory system The respiratory system is an organ system which is used for gas exchange. Among four-legged animals, the respiratory system generally includes tubes, such as the bronchi, used to carry air to the lungs, where gas exchange takes place. A diaphragm pulls air in and pushes it out.
	Rest area In the United States, Canada, Australia and parts of Europe, a rest area, service station, rest stop, service area, service plaza, travel plaza, or service centre is a public works, located adjacent to a highway or Interstate Highway, at which driving and passengers can meal and drink, take a stroll, let their children play in grassy park-like areas, walk their pets, check their vehicle's radiator, sleep
	Restaurant A restaurant is an establishment that serves prepared food and beverages to order, to be meal on the premises. The term covers a multiplicity of venues and a diversity of styles of cuisine. Restaurants are sometimes a feature of a larger complex, typically a hotel, where the dining amenities are provided for the convenience of the residents and for the hotel to maximise their potential revenue.
	Restriction enzyme A restriction enzyme is an enzyme that cuts double-stranded DNA. The enzyme makes two incisions, one through each of the phosphate backbones of the double helix without damaging the nucleotide. The chemical bonds that the enzymes cleave can be reformed by other enzymes known as DNA ligase, so that restriction fragments carved from different chromosomes or genes can be splicing together, provided their ends are complementary .
	Resurrection The term resurrection is used in the literal sense to mean either the religious concept of the reunion of the spirit and the body of a dead person, or the return to life of a dead person. It is used in a figurative sense about broken or discontinued things which were never alive, but which have been restored to a functional state; for example a company which had failed but is reopened by a new owner.
	Resurrection fern The Resurrection fern is a species of creeping, course-textured fern very common in the Southeastern United States, being found as far east as Florida north to New York and west to Texas.
	Retailing Retailing consists of the sales of goods/merchandise for personal or household consumption either from a fixed location such as a department store or kiosk, or away from a fixed location and related subordinated services. In commerce, a retailer buys goods or product in large quantities from manufacturers or importers, either directly or through a wholesaler, and then sells individual items or small quantities to the general public or end user customers, usually in a shop,
	Retaining wall A retaining wall is a structure that holds back earth. Retaining walls stabilize soil and rock from downslope movement or erosion and provide support for vertical or near-vertical grade changes. Cofferdams and bulkheads, structures to hold back water, are sometimes also considered retaining walls.
	Reticular formation The term reticular formation is seldom used anymore except to speak in generalities. Modern anatomy, or neuroscience articles usually refer to the individual nuclei which make up the reticular formation. The reticular formation is a part of the brain which is involved in stereotypical actions, such as walking, sleep, and lying down.
	Reticulated Python The Reticulated Python, with a maximum recorded length 10 meters, is the longest existing snake species. At this weight it may have been as heavy as 200 kg. However, this species is relatively slender and long, and therefore not the largest: the Green Anaconda can be roughly twice as heavy at the same length.Those who work with reticulated pythons often cite an unusual level of intelligence and awareness compared to other species.
	Retie Retie is a municipality located in the Belgium province of Antwerp. The municipality only comprises the town of Retie proper. On January 1 2006 Retie had a total population of 10,321. The total area is 48.39 square kilometre which gives a population density of 213 inhabitants per km.
	Retina The retina is a thin layer of neural cells that lines the back of the eyeball of vertebrates and some cephalopods. In vertebrate embryonic development, the retina and the optic nerve originate as outgrowths of the developing brain. Hence, the retina is part of the central nervous system .
	Retinal In the vision system, retinal, technically called retinene1 or "retinaldehyde", is a light-sensitive retinene molecule found in the photoreceptor cells of the retina. Retinal is the fundamental structure involved in the transduction of light into visual signals, i.e.
	Retinene The Retinenes are chemical derivatives of the dietary supplement vitamin A formed through oxidation reactions. Retinene1 is better known as retinaldehyde or simply retinal and is fundamental in the transduction of light into visual signals in the photoreceptor level of the retina.
	Retinoblastoma Retinoblastoma is a cancer of the retina. Development of this tumor is initiated by mutations that inactivate both copies of the RB1-gene, which codes for the pRb. It occurs mostly in children before the age 5 years and accounts for about 3% of the cancers occurring in children younger than 15 years.
	Retinol Retinol, the dietary form of vitamin A, is a yellow fat-soluble, antioxidant vitamin important in visual system and bone growth. It belongs to the family of chemical compounds known as retinoids. Retinol is ingested in a precursor form; animal sources contain retinyl esters, whereas plants contain pro-vitamin A carotenoids.
	Retirement Retirement is the status of a worker who has stopped working. A person may also semi-retire and keep some sort of job, although usually out of choice rather than necessity. This usually happens upon reaching a determined age, when physical conditions don't allow the person to work any more , or even for personal choice .
	Retort In a chemistry laboratory, a retort is a glassware device used for distillation or dry distillation of substances. It consists of a sphere vessel with a long downward-pointing neck. The liquid to be distilled is placed in the vessel and heated. The neck acts as a Condensation, allowing the evaporated vapors to condense and flow along the neck to a collection vessel placed underneath.
	Retrieve Category:Redirects to Wiktionary
	Retriever A retriever is a type of Gun dog that retrieves game for a hunter. Generally gundogs are divided into three major classifications: retrievers, flushing spaniels, and pointing breeds. Retrievers were bred primarily to retrieve birds or other prey and return them to the hunter without damage.
	Réunion Runion is an island and overseas <333 dpartement of France, located in the Indian Ocean east of Madagascar, about 200 kilometre southwest of Mauritius. Like the other DOMs, Runion is also one of the 26 Rgion in Frances of France with the same status as those situated on the Metropolitan France.
	Reuse Reuse is using an item more than once. This includes conventional reuse where the item is used a number of times for the same function, and new life reuse where a new use is found for the item. It is distinct from recycling, where the used item is broken down into raw materials which are used to make new items.
	Reveal This article is about carpentry. If you were looking for the album by R.E.M. see Reveal and for the American botanist see J.L. Reveal. In carpentry, a reveal is a feature resembling a rabbet, but constructed of separate pieces of wood.
	Revenue stamp A revenue stamp, tax stamp or fiscal stamp is a type of adhesive label used to collect taxes or fees on various items. Many countries of the world have used them, for documents, tobacco products, liquor, medication, playing cards, hunting licenses and other kinds of things.
	Reverberatory furnace A reverbatory furnace is a metallurgy or process furnace which characteristically isolates the material being processed from contact with the fuel, but not from contact with the combustion gases. The term reverberation is used here in a generic sense of rebounding or Reflection without the more common implication of specifically sound reflection.
	Reverse transcriptase In biochemistry, a reverse transcriptase, also known as RNA-directed DNA polymerase, is a DNA polymerase enzyme that transcription single-stranded RNA into double-stranded DNA. Normal transcription involves the synthesis of RNA from DNA, hence reverse transcription is the reverse of this, as it synthesises DNA from RNA.
	Reversing thermometer Unlike most conventional mercury thermometers, a reversing thermometer is able to record a given temperature to be viewed at a later time. If the thermometer is flipped upside down, the current temperature will be shown until it is turned upright again. This was the primary device used by oceanography to determine water temperatures below the surface of the ocean from around 1900 to 1970.
	Revetment Revetments are structures placed on banks or cliffs in such a way as to absorb the energy of incoming waves. They are usually built to preserve the existing uses of the shoreline and to protect the slope. Like seawalls, revetments armor and protect the land behind them. They may be either watertight, covering the slope completely, or porous, to allow water to filter through after the wave energy has been dissipated.
	Revised Standard Version The Revised Standard Version is an English language Bible translation of the Bible that was popular in the mid-20th century and posed the first serious challenge to the King James Version of the Bible owing to its aim to be both a readable and literally accurate modern English translation of the Bible.
	Revisionism Revisionism is a word which has several meanings. One of its first uses was the revision of Marx's doctrine by Eduard Bernstein and Karl Kautsky in the late 19th century. Historical revisionism is often viewed as a legitimate effort by historians to broaden the awareness of certain historical events by re-examining conventional wisdom, as in for example Holocaust denial.
	Revolution A revolution is a drastic change that usually occurs relatively quickly. The word revolution means "a turn around." This may be a change in the social or political institutions over a relatively short period of time, or a major change in its culture or economics. Some revolutions are led by the majority of the populace of a nation, others by a small band of revolutionary, a so-called palace revolution only touches the ruling elite.
	Revolutionary Armed Forces of Colombia The Fuerzas Armadas Revolucionarias de Colombia–Ejrcito del Pueblo or FARC-EP is Colombia's oldest and largest guerrilla group, established in 1964-1966 as the military wing of the Colombian Communist Party. The FARC-EP has since officially broken from that party and created a political structure it calls the Clandestine Colombian Communist Party.
	Revolutionary Organization 17 November November 17 has been described as a Marxism Greece terrorist group ; it is listed on the U.S. State Department list of designated foreign terrorist organizations, the list of EU designated terrorist organisations, and the UK Home Office list of terrorist groups. 17N was named in reference to an Athens Polytechnic uprising against the Greek military junta of 1967-1974 ruling Greece at the time.
	Revolver A revolver is a multishot firearm, usually a handgun, in which the rounds are held in a revolving cylinder that rotates to fire them through a single barrel.
	REVOLVEr rEVOLVEr is the fourth studio album release by Sweden thrash metal band The Haunted. This album merges the raw blueprint of their self-titled debut with the slightly more refined and produced sound evident on their subsequent albums. After several line-up changes, the band sounds more comfortable than ever.
	Revolving door A revolving door is a type of door that, as its name suggests, Rotation around a fixed axis in its frame. An ordinary door is attached to a hinge, which is fastened to the door jamb. It opens only one way, for a theoretical maximum of 180 degrees of rotation. Sometimes hinge-doors can open both ways in their frames, for a theoretical maximum of nearly 360 degrees of rotation.
	Revs Revs is a graffiti artist in New York City who is famous for his huge roller pieces on old buildings. REVS is a prolific NYC graffiti artist who has more recently adopted mixed mediums in his visual repertoire. He has said that REVS is short for REVLON, and he began writing after having an epiphany upon the Manhattan Bridge, but more information is scarce.
	Revue A revue is a type of multi-act popular theatre entertainment that combines music, dance and sketch comedy. The revue has its roots in nineteenth-century American popular entertainment and melodrama, but grew into a substantial cultural presence of its own during its golden years from ca.
	Rex Harrison Sir Reginald Carey "Rex" Harrison was an Academy Awards-winning England theatre and film actor. Harrison was born in Huyton, then part of Lancashire, and educated at Liverpool College. He first appeared on the stage in 1924 in Liverpool.
	Reykjavík Reykjavk is the capital of Iceland, its largest city and the world's most northern national capital city, its latitude being 6408' N, not far from the Arctic Circle. It receives only four hours of daylight per day in the depth of winter, and during the summer the nights are almost as bright as the days.
	Reynard Reynard the Fox, also known as Renard, Renart, Reinard, Reinecke, Reinhardus, Reynardt and by many other spelling variations, is a trickster figure whose tale is told in a number of anthropomorphism fables from medieval Europe.
	Rhamnaceae Rhamnaceae, the Buckthorn family, is a large family of flowering plants, mostly trees, shrubs and some vines. The family contains 50-55 genera and approximately 870-900 species. The Rhamnaceae have a worldwide distribution, but are more common in the subtropical and tropical regions.
	Rhapis Rhapis is a genus of about 10 species of small Arecaceae native to southeastern Asia from southern Japan and southern China south to Thailand. The species are commonly known as Lady Palms. They are List of Arecaceae genera#Tribe Corypheae, with the leaf with a bare petiole terminating in a rounded fan of numerous leaflets.
	Rhetoric Rhetoric is the art or technique of persuasion, usually through the use of language. Rhetoric is one of the three original liberal arts or trivium in Western culture. In ancient and medieval times, grammar concerned itself with correct language use through the study and criticism of literary models, dialectic concerned itself with the testing and invention of new knowledge through a process of question and answer, and rhetoric concerned itself with persuasion in public and political settings such as assemblies and courts o
	Rheumatoid arthritis Rheumatoid arthritis is traditionally considered a chronic, inflammation autoimmunity that causes the immune system to attack the joints. It is a disabling and painful inflammation condition, which can lead to substantial loss of mobility due to pain and joint destruction.
	Rhine The Rhine River is one of the longest and most important rivers in Europe at 1 E6 m , with an average discharge of more than 2,000 cubic meters per second. The name of the Rhine comes from the Celtic languages Renos, literally "that which flows", from the Proto-Indo-European language root *rei- , which is also the origin of the English verb "to run" and the Greek language adage ???ta ?e? ?a? ??d?? ??e?, .
	Rhinoceros The rhinoceros(rhinoceros is greek. rhino for nose, ceros for horn: horn-nosed.) is any of five surviving species of odd-toed ungulates in the family Rhinocerotidae. All five species are native to Africa or Asia. Rhinoceros is also one of the genera in this family.