| rabato | (noun) a wired or starched collar of intricate lace; worn in 17th century | Synonyms: rebato |
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| rabbet | (noun) a rectangular groove made to hold two pieces together | Synonyms: rebate |
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| (verb) cut a rectangular groove into | - |
| (verb) join with a rabbet joint | - |
| rabbi | (noun) spiritual leader of a Jewish congregation; qualified to expound and apply Jewish law | - |
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| rabbinate | (noun) the office or function of a rabbi | - |
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| (noun) rabbis collectively | - |
| rabbinic | (adjective) of or relating to rabbis or their teachings | Synonyms: rabbinical |
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| rabbinical | (adjective) of or relating to rabbis or their teachings | Synonyms: rabbinic |
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| rabbit | (noun) any of various burrowing animals of the family Leporidae having long ears and short tails; some domesticated and raised for pets or food | Synonyms: coney, cony |
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| (noun) flesh of any of various rabbits or hares (wild or domesticated) eaten as food | Synonyms: hare |
| (noun) the fur of a rabbit | Synonyms: lapin |
| (verb) hunt rabbits | - |
| rabbiteye | (noun) shrub of southeastern United States grown commercially especially for canning industry | Synonyms: rabbit-eye blueberry, rabbiteye blueberry, Vaccinium ashei |
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| rabbitfish | (noun) large European chimaera | Synonyms: Chimaera monstrosa |
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| rabbitweed | (noun) low-growing sticky subshrub of southwestern United States having narrow linear leaves on many slender branches and hundreds of tiny yellow flower heads | Synonyms: broom snakeroot, broom snakeweed, Gutierrezia sarothrae, rabbit-weed, snakeweed, turpentine weed |
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| rabbitwood | (noun) shrub of southeastern United States parasitic on roots of hemlocks having sparse spikes of greenish flowers and pulpy drupes | Synonyms: buffalo nut, Pyrularia pubera |
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| rabble | (noun) a disorderly crowd of people | Synonyms: mob, rout |
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| (noun) disparaging terms for the common people | Synonyms: ragtag, ragtag and bobtail, riffraff |
| rabid | (adjective) of or infected by rabies | - |
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| (adjective) marked by excessive enthusiasm for and intense devotion to a cause or idea | Synonyms: fanatic, fanatical, overzealous |
| rabidity | (noun) unrestrained excitement or enthusiasm | Synonyms: madness, rabidness |
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| (noun) The property of being very extreme, unreasonable, or fanatical in opinion; excessively zealous; comparable to one with rabies. | - |
| rabidly | (adverb) in the manner of an animal with rabies | - |
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| (adverb) in an extreme or fanatical manner | - |
| rabidness | (noun) unrestrained excitement or enthusiasm | Synonyms: madness, rabidity |
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| rabies | (noun) an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain | Synonyms: hydrophobia, lyssa, madness |
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| raccoon | (noun) an omnivorous nocturnal mammal native to North America and Central America | Synonyms: racoon |
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| (noun) the fur of the North American racoon | - |
| race | (noun) a canal for a current of water | Synonyms: raceway |
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| (noun) a contest of speed | - |
| (noun) any competition | - |
| (noun) people who are believed to belong to the same genetic stock | - |
| (noun) (biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species | Synonyms: subspecies |
| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: airstream, backwash, slipstream, wash |
| (verb) compete in a race | Synonyms: run |
| (verb) move hurridly | Synonyms: belt along, bucket along, cannonball along, hasten, hie, hotfoot, pelt along, rush, rush along, speed, step on it |
| (verb) cause to move fast or to rush or race | Synonyms: rush |
| (verb) to work as fast as possible towards a goal, sometimes in competition with others | - |
| raceabout | (noun) a small sloop having the keep of a knockabout but with finer lines and carrying more sail | - |
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| racecard | (noun) a program for a race meeting; lists the races and the names of the horses | - |
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| racecourse | (noun) a course over which races are run | Synonyms: racetrack, raceway, track |
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| racehorse | (noun) a horse bred for racing | Synonyms: bangtail, race horse |
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| raceme | (noun) usually elongate cluster of flowers along the main stem in which the flowers at the base open first | - |
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| racemose | (adjective) having stalked flowers along an elongated stem that continue to open in succession from below as the stem continues to grow | - |
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| racer | (noun) an animal that races | - |
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| (noun) slender fast-moving North American snakes | - |
| (noun) a fast car that competes in races | Synonyms: race car, racing car |
| (noun) someone who drives racing cars at high speeds | Synonyms: automobile driver, race driver |
| racerunner | (noun) very swift lizard of eastern and central United States | Synonyms: Cnemidophorus sexlineatus, race runner, six-lined racerunner |
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| racetrack | (noun) a course over which races are run | Synonyms: racecourse, raceway, track |
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| raceway | (noun) a canal for a current of water | Synonyms: race |
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| (noun) a course over which races are run | Synonyms: racecourse, racetrack, track |
| rachet | (noun) mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction | Synonyms: ratch, ratchet |
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| rachis | (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, backbone, spinal column, spine, vertebral column |
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| (noun) axis of a compound leaf or compound inflorescence | - |
| rachischisis | (noun) a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis | Synonyms: schistorrhachis, spina bifida |
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| rachitic | (adjective) affected with, suffering from, or characteristic of rickets | Synonyms: rickety |
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| rachitis | (noun) childhood disease caused by deficiency of vitamin D and sunlight associated with impaired metabolism of calcium and phosphorus | Synonyms: rickets |
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| (noun) inflammation of the vertebral column | - |
| racial | (adjective) of or characteristic of race or races or arising from differences among groups | - |
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| (adjective) of or related to genetically distinguished groups of people | - |
| racialism | (noun) discriminatory or abusive behavior towards members of another race | Synonyms: racial discrimination, racism |
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| racialist | (noun) a person with a prejudiced belief that one racial group is superior to others | Synonyms: racist |
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| racially | (adverb) with respect to race | - |
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| racily | (adverb) in a racy manner | - |
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| raciness | (noun) behavior or language bordering on indelicacy | Synonyms: gaminess, ribaldry, spiciness |
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| (noun) a strong odor or taste property | Synonyms: bite, pungency, sharpness |
| racing | (noun) the sport of engaging in contests of speed | - |
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| racism | (noun) discriminatory or abusive behavior towards members of another race | Synonyms: racial discrimination, racialism |
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| (noun) the prejudice that members of one race are intrinsically superior to members of other races | - |
| racist | (adjective) discriminatory especially on the basis of race or religion | Synonyms: anti-Semite, antiblack |
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| (adjective) based on racial intolerance | - |
| (noun) a person with a prejudiced belief that one racial group is superior to others | Synonyms: racialist |
| rack | (noun) a rapid gait of a horse in which each foot strikes the ground separately | Synonyms: single-foot |
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| (noun) a form of torture in which pain is inflicted by stretching the body | - |
| (noun) a support for displaying ot holding various articles | Synonyms: stand |
| (noun) an instrument of torture that stretches or disjoints or mutilates victims | Synonyms: wheel |
| (noun) the destruction or collapse of something | Synonyms: wrack |
| (noun) rib section of a forequarter of veal or pork or especially lamb or mutton | - |
| (verb) torture on the rack | - |
| (verb) seize together, as of parallel ropes of a tackle in order to prevent running through the block | - |
| (verb) place in a rack | Synonyms: rack up |
| (verb) work on a rack | - |
| (verb) stretch to the limits | - |
| (verb) torment emotionally or mentally | Synonyms: excruciate, torment, torture |
| (verb) go at a rack | Synonyms: single-foot |
| (verb) draw off from the lees | - |
| (verb) run before a gale | Synonyms: scud |
| (verb) fly in high wind | - |
| (verb) obtain by coercion or intimidation | Synonyms: extort, gouge, squeeze, wring |
| (verb) put on a rack and pinion | - |
| racker | (noun) an attendant who puts pool or billiard balls into a rack | - |
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| racket | (noun) an illegal enterprise (such as extortion or fraud or drug peddling or prostitution) carried on for profit | Synonyms: fraudulent scheme, illegitimate enterprise |
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| (noun) a sports implement (usually consisting of a handle and an oval frame with a tightly interlaced network of strings) used to strike a ball (or shuttlecock) in various games | Synonyms: racquet |
| (noun) the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience | Synonyms: dissonance, noise |
| (noun) a loud and disturbing noise | - |
| (verb) hit (a ball) with a racket | - |
| (verb) make loud and annoying noises | - |
| (verb) celebrate noisily, often indulging in drinking; engage in uproarious festivities | Synonyms: jollify, make happy, make merry, make whoopee, revel, wassail, whoop it up |
| racketeer | (noun) someone who commits crimes for profit (especially one who obtains money by fraud or extortion) | - |
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| (verb) carry on illegal business activities involving crime | - |
| racketeering | (noun) engaging in a racket | - |
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| racketiness | (noun) the auditory effect characterized by loud and constant noise | Synonyms: noisiness |
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| rackety | (adjective) uncontrollably noisy | Synonyms: rip-roaring, uproarious |
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| racking | (adjective) causing great physical or mental suffering | Synonyms: wrenching |
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| racon | (noun) a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position | Synonyms: radar beacon |
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| raconteur | (noun) a person skilled in telling anecdotes | Synonyms: anecdotist |
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| racoon | (noun) an omnivorous nocturnal mammal native to North America and Central America | Synonyms: raccoon |
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| racquet | (noun) a sports implement (usually consisting of a handle and an oval frame with a tightly interlaced network of strings) used to strike a ball (or shuttlecock) in various games | Synonyms: racket |
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| racquetball | (noun) a game played on a handball court with short-handled rackets | - |
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| (noun) the ball used in playing the game of racquetball | - |
| racy | (adjective) designed or suitable for competing in a race | - |
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| (adjective) suggestive of sexual impropriety | Synonyms: blue, gamey, gamy, juicy, naughty, risque, spicy |
| (adjective) full of zest or vigor | Synonyms: lively |
| (adjective) marked by richness and fullness of flavor | Synonyms: full-bodied, rich, robust |
| rad | (noun) a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material | - |
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| (noun) the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | Synonyms: radian |
| radar | (noun) measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects | Synonyms: microwave radar, radio detection and ranging, radiolocation |
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| raddle | (noun) a red iron ore used in dyeing and marking | Synonyms: reddle, ruddle |
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| (verb) mark or paint with raddle | - |
| (verb) twist or braid together, interlace | Synonyms: ruddle |
| raddled | (adjective) showing the wearing effects of overwork or care or suffering | Synonyms: careworn, drawn, haggard, worn |
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| (adjective) used until no longer useful | Synonyms: worn-out |
| radial | (adjective) relating to or moving along or having the direction of a radius | - |
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| (adjective) relating to or near the radius | - |
| (adjective) issuing in rays from a common center; relating to rays of light | - |
| (adjective) arranged like rays or radii; radiating from a common center | Synonyms: radiate, stellate |
| (noun) pneumatic tire that has radial-ply casing | Synonyms: radial-ply tire, radial tire |
| radially | (adverb) in a radial manner | - |
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| radian | (noun) the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | Synonyms: rad |
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| radiance | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiancy, refulgence, refulgency, shine |
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| (noun) the amount of electromagnetic radiation leaving or arriving at a point on a surface | Synonyms: glow, glowing |
| (noun) an attractive combination of good health and happiness | - |
| radiancy | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, refulgence, refulgency, shine |
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| radiant | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, effulgent, refulgent |
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| radiantly | (adverb) in a radiant manner | - |
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| radiate | (adjective) having rays or ray-like parts as in the flower heads of daisies | - |
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| (adjective) arranged like rays or radii; radiating from a common center | Synonyms: radial, stellate |
| (verb) send out real or metaphoric rays; the children radiated joyous energy | - |
| (verb) issue or emerge in rays or waves | - |
| (verb) spread into new habitats and produce variety or variegate | Synonyms: diversify |
| (verb) experience a feeling of well-being or happiness, as from good health or an intense emotion | Synonyms: beam, glow, shine |
| (verb) cause to be seen by emitting light as if in rays | - |
| (verb) have a complexion with a strong bright color, such as red or pink | Synonyms: beam, glow, shine |
| (verb) extend or spread outward from a center or focus or inward towards a center | Synonyms: ray |
| (verb) send out rays or waves | - |
| radiating | (adjective) diverging from a common point | - |
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| radiation | (noun) the act of spreading outward from a central source | - |
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| (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, irradiation, radiation therapy, radiotherapy |
| (noun) a radial arrangement of nerve fibers connecting different parts of the brain | - |
| (noun) the spread of a group of organisms into new habitats | - |
| (noun) energy that is radiated or transmitted in the form of rays or waves or particles | - |
| (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radioactivity |
| (noun) syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours | Synonyms: radiation sickness, radiation syndrome |
| radiator | (noun) a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan | - |
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| (noun) heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings | - |
| (noun) any object that radiates energy | - |
| radical | (adjective) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem | Synonyms: basal |
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| (adjective) of or relating to or constituting a linguistic root | - |
| (adjective) arising from or going to the root or source | - |
| (adjective) (used of opinions and actions) far beyond the norm | Synonyms: extremist, ultra |
| (adjective) markedly new or introducing radical change | Synonyms: revolutionary |
| (noun) a character conveying the lexical meaning of a logogram | - |
| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: base, root, root word, stem, theme |
| (noun) a person who has radical ideas or opinions | - |
| (noun) (mathematics) a quantity expressed as the root of another quantity | - |
| (noun) (chemistry) two or more atoms bound together as a single unit and forming part of a molecule | Synonyms: chemical group, group |
| (noun) an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule | Synonyms: free radical |
| radicalism | (noun) the political orientation of those who favor revolutionary change in government and society | - |
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| radicalize | (verb) make more radical in social or political outlook | - |
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| radically | (adverb) in a radical manner | - |
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| radicchio | (noun) prized variety of chicory having globose heads of red leaves | - |
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| radicle | (noun) (anatomy) a small structure resembling a rootlet (such as a fibril of a nerve) | - |
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| radiculitis | (noun) inflammation of the radicle of a nerve | - |
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| radio | (adjective) indicating radiation or radioactivity | - |
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| (noun) a communication system based on broadcasting electromagnetic waves | Synonyms: wireless |
| (noun) an electronic receiver that detects and demodulates and amplifies transmitted signals | Synonyms: radio receiver, radio set, receiving set, tuner, wireless |
| (noun) medium for communication | Synonyms: radiocommunication, wireless |
| (verb) transmit messages via radio waves | - |
| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| radioactively | (adverb) in a radioactive manner | - |
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| radioactivity | (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radiation |
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| radiobiologist | (noun) a biologist who studies the effects of radiation on living organisms | - |
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| radiobiology | (noun) the branch of biology that studies the effects of radiation on living organisms | - |
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| radiocarbon | (noun) a radioactive isotope of carbon | Synonyms: carbon 14 |
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| radiochemist | (noun) a chemist who specializes in nuclear chemistry | Synonyms: nuclear chemist |
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| radiochemistry | (noun) the chemistry of radioactive substances | Synonyms: nuclear chemistry |
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| radiochlorine | (noun) a radioactive isotope of chlorine | - |
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| radiocommunication | (noun) medium for communication | Synonyms: radio, wireless |
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| radiogram | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiograph, shadowgraph, skiagram, skiagraph |
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| (noun) a message transmitted by wireless telegraphy | - |
| radiograph | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiogram, shadowgraph, skiagram, skiagraph |
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| radiographer | (noun) a person who makes radiographs | - |
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| radiographic | (adjective) relating to or produced by radiography | - |
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| radiography | (noun) photography that uses other kinds of radiation than visible light | - |
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| (noun) the process of making a radiograph; producing an image on a radiosensitive surface by radiation other than visible light | Synonyms: skiagraphy |
| radioimmunoassay | (noun) immunoassay of a substance that has been radioactively labeled | - |
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| radioisotope | (noun) a radioactive isotope of an element; produced either naturally or artificially | - |
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| radiolarian | (noun) protozoa with amoeba-like bodies and radiating filamentous pseudopods | - |
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| radiolocate | (verb) locate by means of radar | - |
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| radiolocation | (noun) measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects | Synonyms: microwave radar, radar, radio detection and ranging |
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