| 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 |
| 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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| 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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| 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 | - |
| 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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| 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 | (noun) a person with a prejudiced belief that one racial group is superior to others | Synonyms: racialist |
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| 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 | - |
| 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 | - |
| racketeer | (noun) someone who commits crimes for profit (especially one who obtains money by fraud or extortion) | - |
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| 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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| 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 | - |