colt

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A young male horse, especially an ungelded racehorse less than five years old, or a young male of another equine species.
• noun A youthful or inexperienced person; a novice.

from The Century Dictionary.

• To frisk, frolic, or run at large, like a colt.
• [Cf. calve, v., 2, and cave, verb, II., 2.] To become detached, as a mass of earth from a bank or excavation; cave: with in.
• To befool; fool.
• To beat with a rope's end. See colt, n., 4.
• noun A young horse, or a young animal of the horse tribe: commonly and distinctively applied to the male, the young female being a filly.
• noun A person new to office or to the exercise of any art; a green hand: as, a team of colts at cricket.
• noun A cheat; a slippery fellow.
• noun A rope's end used for punishment; also, a piece of rope with something heavy at the end used as a weapon.
• noun The second after-swarm of bees.
• noun Synonyms Filly, etc. See pony.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb obsolete To frisk or frolic like a colt; to act licentiously or wantonly.
• transitive verb To horse; to get with young.
• transitive verb obsolete To befool.
• noun The young of the equine genus or horse kind of animals; -- sometimes distinctively applied to the male, filly being the female. Cf. foal.
• noun A young, foolish fellow.
• noun A short knotted rope formerly used as an instrument of punishment in the navy.
• noun an imperfect or superfluous tooth in young horses.
• noun to cease from youthful wantonness.
• noun to be wanton.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A young male horse
• noun A youthful or inexperienced person; a novice
• noun nautical A short piece of rope once used by petty officers to urge men to work
• verb obsolete, transitive To horse; to get with young.
• verb obsolete, transitive To befool.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a kind of revolver
• noun a young male horse under the age of four