jock

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Sports A jockey.
2. n. A disc jockey.
3. n. An athletic supporter.
4. n. Sports An athlete, especially in college.
5. n. Slang One characterized by excessive concern for machismo.

Century Dictionary and Cyclopedia

1. To jolt.
2. n. Same as Jack, 1.
3. n. [lowercase] Same as jockey.
4. n. An iron rod, usually pronged, which is attached to the rear end of a train of mine-cars ascending an incline, and trails behind, to stop the descent of the cars if the rope breaks.
5. n. A nautical name for a Scotch seaman.

Wiktionary

1. n. slang, archaic A common man.
2. n. UK, slang, pejorative A Scotsman.
3. v. slang to masturbate
4. v. slang to humiliate
5. v. slang to steal
6. n. slang, rare, dated The penis.
7. n. An athletic supporter worn by men to support the genitals especially during sports, a jockstrap.
8. n. US, slang An athlete.
9. n. US, slang, pejorative An enthusiastic athlete or sports fan, especially one with few other interests. A slow-witted person of large size and great physical strength. A pretty boy that shows off in sport.
10. n. US, slang, computing A specialist computer programmer

GNU Webster's 1913

1. n. a person trained to compete in sports; an athlete.
2. n. A jockstrap.
3. n. A disk jockey.

WordNet 3.0

1. n. a support for the genitals worn by men engaging in strenuous exercise
2. n. a person trained to compete in sports