Reef knot The reef knot or square knot is a common and simple binding knot. Tying a reef knot To tie a reef knot, tie a left-handed overhand knot and then a right-handed overhand knot or vice versa. A common mnemonic for this procedure is "right over left, left over right".
	Reel A reel is an object around which lengths of another material are wound for storage. Generally a reel has a cylindrical core and walls on the sides to retain the material wound around the core. In some cases the core is hollow, although other items may be mounted on it, and grips may exist for mechanically turning the reel.
	Reeler The reeler is an autosomal recessive mouse mutant, in which cortical neurons are generated normally but are abnormally placed, resulting in disorganization of cortical laminar layers in the CNS. The reason is the lack of Reelin, an extracellular matrix glycoprotein, which during the corticogenesis is secreted mainly by the Cajal-Retzius cells.
	Referee A referee is a person who has authority to make decisions about play in many sports. Officials in some sports are known by a variety of other titles, including umpire, judge or linesman.
	Reflecting telescope A reflecting telescope is an optical telescope which uses a combination of curved and plane mirrors to reflect light and form an image, rather than lens to refract or bend light to form an image. The Italian monk Niccolo Zucchi is credited with making the first reflector in 1616, but his inability to shape the concave mirror accurately and the lack of means of viewing the image without blocking the mirror, caused Zucchi to give up on the idea.
	Reflex arc A reflex arc is the neural pathway that mediates a reflex action. In higher animals, these pathways do not pass through the brain, but synapse in the spinal cord. This characteristic allows reflex actions to occur relatively quickly. If a reflex arc consists of only two neurons, it is defined as monosynaptic.
	Reflexive Something reflexive refers to itself.
	Reflux Reflux is a technique used in chemistry to apply energy to reactions over an extended period of time. A liquid reaction mixture is placed in a vessel open only at the top. This vessel is connected to a Liebig condenser, such that any vapours given off are cooled back to liquid, and fall back into the reaction vessel.
	Reforestation Reforestation is the process of restoring and recreating areas of woodlands or forest that once existed but were deforestation or otherwise removed or destroyed at some point in the past. The resulting forest can provide both ecosystem and logging benefits and has the potential to become a major carbon sink.
	Reform Judaism Reform Judaism can refer to the largest denomination of American Jew and its sibling movements in other countries, a branch of Judaism in the United Kingdom, and the historical predecessor of the American movement that originated in 19th Century Germany.
	Refracting telescope A refracting or refractor telescope is a type of optical telescope telescope that refraction or bends light at each end using lens. This refraction causes Parallel light rays to converge at a focal point; while those which were not parallel converge upon a focal plane.
	Refraction Refraction is the change in direction of a wave due to a change in its velocity. This is most commonly seen when a wave passes from one optical medium to another. Refraction of light is the most commonly seen example, but any type of wave can refract when it interacts with a medium, for example when sound waves pass from one medium into another.
	Refractory period A refractory period, in physiology, is a period of time during which an organ or cell is incapable of performing a particular action.
	Refresh Refresh may refer to: *Refresh rate, the rate at which a display illuminates *Meta refresh, an HTML tag *Memory refresh, reading and writing to the same area of computer memory *Refreshable Braille display, a device for blind computer users *Refresh My Heart, a 1991 album by Christian pop rock artist Rebecca St.
	Refrigeration Refrigeration is defined as the process of removing heat from an enclosed space or from a substance and rejecting it elsewhere for the primary purpose of lowering the temperature of the enclosed space or substance and then maintaining that lower temperature. To satisfy the Second Law of Thermodynamics, mechanical work must be performed to accomplish this.
	Refrigerator A refrigerator is an appliance for the storage and preservation of perishable food. One compartment, referred to as a freezer, usually shares space in the unit with another compartment for cold temperatures maintained above freezing. The refrigerator is a relatively modern invention amongst kitchen appliances.
	Refrigerator car A refrigerator car is a Refrigeration boxcar, a piece of railroad rolling stock designed to carry perishable freight at specific temperatures. Refrigerator cars differ from simple Thermal insulation boxcars and ventilation boxcars, neither of which are fitted with cooling apparatus.
	Refugee A refugee is a person seeking asylum in a foreign country in order to escape persecution, war, terrorism, extreme poverty, famines, or natural disaster. Some regional legal instruments further include those seeking to escape generalized violence in the definition of a refugee.
	Refugee camp A refugee camp is a camp built up by governments or Non-governmental organizations to receive refugees. Thousands of people may live in refugee camps. Since refugee camps are generally set up in an impromotu fashion, and designed to meet basic human needs for a short time, when civil war or other problems prevent the return of refugees, or children essentially grow up in the camps, a Humanitarianism crisis can result.
	Refurbishment Refurbishment is the process of major repair and maintenance or minor repair of an item, either aesthetically or mechanism. Often, antiques such as furniture are refurbished to bring back their original luster by applying new paint or wood stain, fixing loose joints with glue or nails, and cleaning or replacing hardware such as drawer pulls.
	Regalia Regalia is a Latin plurale tantum for the privileges and insignia, characteristic of a king or other sovereign. It stems from the Latin substantivation of the adjective regalis, 'regal', itself from Rex, 'king'.
	Reggae Reggae is a music genre developed in Jamaica in the late 1960s. The term reggae is sometimes used in a broad sense to refer to most types of Jamaican music, including ska, rocksteady and dub music.The term is more specifically used to indicate a particular style that originated after the development of rocksteady.
	Regimen #REDIRECT Regime
	Regiomontanus Johannes Mller von Knigsberg , known by his Latin pseudonym Regiomontanus, was an important Germany mathematician, astronomer and astrologer. He was born in the Franconian village of Unfinden near Knigsberg, Bavaria . He is also called Johannes Mller, der Knigsberger .
	Régional [Image:air.france.erj145.750pix.jpg|thumb|right|R?gional Embraer ERJ 145]] R?gional is a subsidiary airline wholly owned by Air France which connects hubs at Paris, Lyon, Clermont-Ferrand, and Bordeaux to 49 airports in Europe.
	Registered mail Registered items of mail are letters which have their details recorded in a register to enable their location to be tracked. The item is pre-paid with the normal postage rate and an additional charge known as a registration fee. Upon payment of this fee the sender is given a receipt, and a registration label with a unique number is affixed to the letter.
	Regression analysis In statistics, regression analysis is used to model relationships between variables, determine the magnitude of the relationships between variables, and can be used to make predictions based on the models.
	Regular polygon A regular polygon is a simple polygon which is :wikt:equiangular and equilateral. All regular polygons with the same number of sides are similarity. Examples: * Regular digon: degenerate, a "double line segment" * Equilateral triangle * Square
	Regulus Regulus is the brightest star in the constellation Leo and list of brightest stars in the nighttime sky. Regulus is approximately 77.5 light years from Earth's Solar System. Its name is Latin for "prince." It is also known as Al Qalb Al Asad, from Arabic language ????? ????? al-qalb[u] al-asad, meaning "the heart of the lion." This phrase is sometimes approximated as Kabelaced, or translated into Latin as Cor Leonis.
	Reign of Terror The Reign of Terror or simply The Terror was a period in the French Revolution characterized by brutal repression. The stated aim of the Terror was to defend the Revolution by destroying internal enemies and conspirators and chasing external enemies from France territory.
	Reims Reims is a city of northern France, 144 km east-northeast of Paris. Its history can be traced back to the period of the Roman Empire. Reims played testing a very important role in history of France, as it was the place where the kings of France were crowned.
	Rein Reins are a type of horse tack. A bridle is an arrangement of straps around the horse's head used for riding and driving the animal. A bridle contains a bit attached to reins. Reins are leather straps or rope attached to the outer ends of a bit that extend to the rider's or driver's hands.
	Reincarnation "Past Lives" redirects here. For the 2002 Black Sabbath album, see Past Lives . Reincarnation, literally "to be made flesh again", as a doctrine or mysticism belief, holds the notion that some essential part of a living being can survive death in some form, with its integrity partly or wholly retained, to be reborn in a new body.
	Reindeer The reindeer, known as caribou when wild in North America, is an Arctic and Subarctic-dwelling deer.
	Reinforced concrete Reinforced concrete, also called ferroconcrete in some countries, is concrete in which reinforcement bars or fibers have been incorporated to strengthen the material that would otherwise be brittle.
	Reinforcement In operant conditioning, reinforcement is any change in an organism's surroundings that: * occurs regularly when the organism behaves in a given way, and * is associated with an increase in the probability that the response will be made or in another measure of its strength. For example: you give your dog food every time it sits when you tell it to.
	Rejected Rejected is an 2000 animated short comedy film by animator Don Hertzfeldt that was nominated for a 2001 Academy Award for Academy Award for Animated Short Film. It received 27 awards from film festivals around the world and in 2004 was ranked by the Internet Movie Database as the 3rd most popular short film of all time.
	Related Related was an United States television program that began its first season on The WB network in 2005. The show is a combination of comedy and drama with some soap opera elements. It is about four sisters of Italian people descent who were raised in Brooklyn and live in New York City.
	Relative humidity Relative humidity is a term used to describe the quantity of water vapor that exists in a gaseous mixture of air and water.
	Relay A relay is an electrical switch that opens and closes under control of another electrical circuit. In the original form, the switch is operated by an magnet to open or close one or many sets of contacts. It was invented by Joseph Henry in 1835. Because a relay is able to control an output circuit of higher power than the input circuit, it can be considered, in a broad sense, to be a form of electrical amplifier.
	Relay race During a relay race, members of a team take turns swimming or running parts of a circuit or performing a certain action. Relay races take the form of professional races and amateur games. In the Olympic games, there are many types of relay races that are part of track and field.
	Relevance Relevance is a term used to describe how pertinent, connected, or applicable some information is to a given matter.
	Reliant Reliant was a automobile manufacturing in England. The company was based at Tamworth in Staffordshire although since 2001 it has moved to nearby Cannock.
	Relic A relic is an object, especially a piece of the body or a personal item of someone of Religion significance, carefully preserved with an air of veneration as a tangible memorial. Relics are an important aspect of Buddhism, some Religious denomination of Christianity, Hinduism, shamanism, and many other personal belief systems.
	Relief A relief is a sculptured art where a modeled form projects out from a flat background. Reliefs are a common type of artwork found throughout the world, particularly to decorate monumental buildings, such as temples. The frieze in the classical Corinthian order is often enriched with bas-relief .
	Relief pitcher A relief pitcher or reliever is a baseball or softball pitcher who enters the game after the starting pitcher is removed due to injury, ineffectiveness or fatigue. Relievers are further divided informally into closer, middle relief pitchers, left-handed specialists, set-up pitchers and long relievers.
	Religion Religion is a system of social coherence based on a common group of beliefs or attitudes concerning an object, person, unseen being, or system of thought considered to be supernatural, sacred, divine or Dharma, and the moral codes, practices, values, institutions, and rituals associated with such belief or system of thought.
	Religious belief Religious belief refers to a faith or creed concerning the supernatural, sacred, or divine. It may concern the existence, nature and worship of a deity or deities and divine involvement in the universe and human life. It may also relate to the values and practices based on the teachings of a spiritual leader.
	Religious festival A religious festival is a time of special importance marked by adherents to that religion. Religious festivals are commonly celebrated on reoccurring cycles in a calendar year or lunar calendar. This means that, because ancient calendars were not hugely accurate, the exact date of the festival changes each year.
	Religious Society of Friends The Religious Society of Friends began in England in the 17th century by people who were dissatisfied with the existing denominations and sects of Christianity. Traditionally George Fox has been credited as the founder or the most important early figure. The Society of Friends is counted among the historic peace churches.
	Religious text Most religions have religious texts they view as sacred. Many religions and Spirituality movements believe that their sacred texts are wholly divine or spiritually revelation in origin. Monotheism religions often view their sacred texts as the "Word of God", often feeling that the texts are inspired by God.
	Reliquary A reliquary is a container for relic. These may be the physical remains of saints, such as bones or shreds of clothing, or some object associated with the saints or other holy figures.. A philatory is a transparent reliquary to contain and exhibit the bones and relics of saints.
	Remand Remand is a legal term which has two related but distinct usages. Its etymology is from the Latin re- and mandare, literally "to order." It evolved in Late Latin to remandare, or "to send back word." It appears in Middle French as remander and in Middle English as remaunden, both with essentially the same meaning, "to send back."
	Rembrandt Rembrandt Harmenszoon van Rijn is generally considered one of the greatest painters in European art history and the most important in Netherlands history. Rembrandt was also a proficient printmaker and made many drawings. His contributions to art came in a period that historians call the Dutch Golden Age, in which Dutch world power, political influence, science, commerce, and culture — particularly Dutch Golden Age painting — reached their pinnacle.
	Remembrance Day Remembrance Day , also known as Veteran's Day , Poppy Day , and Armistice Day is a day of commemoration observed in the Commonwealth of Nations, the United States of America, and various Europe and other countries to commemorate the sacrifice of veterans and civilians in World War I and other wars.
	Remembrance Days Remembrance Days is The Dream Academy second album. Sadly, the album failed to live up to the chart and sales expectations of their eponymous debut album, The Dream Academy. However, it is a fan and band favorite and most of the singles were well received with Indian Summer being played on VH1 on the radio but again none of them managed to reach the charts in the UK or the USA.
	Remembrance Sunday In the United Kingdom Remembrance Sunday is the Sunday nearest to November 11 - Remembrance Day, which is the anniversary of when hostilities in the World War I ended at 11 a.m in 1918. Remembrance Sunday is marked by ceremonies at local war memorials in most towns and villages, attended by civic dignitaries, ex-servicemen and women, youth organisations, and military cadet forces.
	Remittances Remittances are transfers of money by foreign workers to their home countries. The World Bank officially estimates that Human migrations from developing countries in developed countries sent home more than $223 billion to their families in developing countries in 2005 a figure more than twice the level of international aid.
	Remnants Remnants is a science fiction book series authored by K. A. Applegate. It is the story of what happens to the survivors of a desperate mission to save a handful of human beings after an asteroid collides with Earth. Eighty people are placed aboard a converted space shuttle using untested hibernation technology and fired blindly into space hours before all life on Earth is obliterated by a large asteroid called The Rock.
	Remora Remoras or suckerfish are elongate brown fish in order Perciformes and family Echeneidae. They grow up to 30-90 Metre#SI_multiples long, and their distinctive dorsal fin takes the form of a modified oval sucker-like organ with slat-like structures that open and close to create suction and take a firm hold against the skin of larger marine animals.
	Remorse Remorse is an emotion experienced by one who feels they have committed an action contrary to their morality code. It is characterised by feelings of regret, self-hatred and a desire to make the wrong thing right. The idea of remorse is used in restorative justice. One incapable of feeling remorse is often labelled a antisocial personality disorder or psychopath - formerly a Diagnostic and Statistical Manual of Mental Disorders condition.
	Remote control A remote control is an Electronics device used for the remote operation of a machine. The term, sometimes abbreviated to "remote" and also called a "flipper" or "clicker", is most commonly used to refer to a remote control for televisions or other consumer electronics such as stereophonic sound systems and DVD players, and to turn on and off a plug.
	Renaissance In the traditional view, the Renaissance was understood as a historical age in Europe that followed the Middle Ages and preceded the Reformation, spanning roughly the 14th century through the 16th century. The Italian Renaissance of the 15th century represented a reconnection of the west with classical antiquity, the absorption of knowledge , a focus on the importance of living well in the present , and an explosion of the dissemination of knowledge brought on by the advent of printing.
	Renata Tebaldi The Italy opera singer Renata Tebaldi was a popular soprano of the post-World War II period. Tebaldi was born Renata Ersilia Clotilde Tebaldi in Pesaro. Very soon, the parents split up and Renata, together with her mother Giuseppina Barbieri, move to the latters home town, Langhirano in the Province of Parma.
	Rend Rend is one of the main river of Surguja district in the state of Chhattisgarh. Also referred as Rehar or Rihand, it rises in the region south west of the Mainpat plateau, which is about 1,100 meters above mean sea level, from Matiranga hills. The river flows north roughly through the central part of the district for 160 km.
	René Antoine Ferchault de Réaumur Ren Antoine Ferchault de Raumur was a France scientist of wide-ranging interests who made contributions in many fields, especially entomology. Raumur was born and educated at La Rochelle. He was taught philosophy in the Society of Jesus college at Poitiers, and in 1699 went to Bourges to study Civil law and mathematics under the charge of an uncle, canon of La Sainte-Chapelle.
	René Descartes Ren Descartes , also known as Cartesius, was a noted French philosophy, mathematician, and scientist. Dubbed the "Founder of Modern Philosophy" and the "List of people known as father or mother of something," he ranks as one of the most important and influential thinkers of modern times.
	René Magritte Ren Franois Ghislain Magritte was a List of Belgians Surrealist artist. He is well known for a number of witty and amusing images.
	Renovation Renovation is the process of restoring or improving a structure. Two prominent types of renovations are commercial and residential.
	Repeat In music a repeat is the Musical notation which indicates a musical form should be repeated. If the piece has one repeat sign alone, then that means to repeat from the beginning, and then continue on. A corresponding sign facing the other way indicates where the repeat is to begin.