racer

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. One that races or takes part in a race.
2. n. A vehicle used in racing.
3. n. Any of various fast-moving North American snakes of the genus Coluber.

Century Dictionary and Cyclopedia

1. n. One who races; a runner or contestant in a race or in races of any kind.
2. n. A race-horse.
3. n. Hence, anything having great speed.
4. n. In a braiding-machine, a traversing support for tension and spool-holding apparatus.
5. n. A snake of the genus Scotophis (or Coluber), S. obsoletus, also called pilot black-snake or pilot-snake, It is black, with a mottled black and yellow belly, and has the median dorsal scales carinated.
6. n. A snake, Bascanion constrictor, the common black-snake of the eastern United States. It is blue or blue-black, with greenish-blue belly, and has smooth scales.
7. n. A poor, thin, or spent fish; a slink: applied to mackerel, shad, salmon, etc.
8. n. A sandcrab. See Ocypoda
9. n. Same as race-plate.
10. n. In the Southern States, applied to the corn-snake, Callopeltis getulus, a large harmless snake of a reddish-brown color with redder markings.

Wiktionary

1. n. Someone who takes part in a race.
2. n. A racehorse.
3. n. An animal known for its fast speed, or suitable for racing; applied especially to a number of North American snakes, certain kinds of lake trout, etc.
4. n. A vehicle or other device used for racing.

GNU Webster's 1913

1. n. One who, or that which, races, or contends in a race; esp., a race horse.
2. n. (Zoöl.) The common American black snake.
3. n. (Mil.) One of the circular iron or steel rails on which the chassis of a heavy gun is turned.

WordNet 3.0

1. n. a fast car that competes in races
2. n. an animal that races
3. n. someone who drives racing cars at high speeds
4. n. slender fast-moving North American snakes