bolter

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A horse given to bolting.
2. n. One who gives up membership in or withdraws support from a political party.
3. n. A machine used for sifting, especially for sifting flour.
4. n. One who operates a sifting machine.

Century Dictionary and Cyclopedia

1. n. One who bolts, in any sense of the verb. Specifically— One who bolts or turns aside; a horse that bolts.
2. n. A sieve; an instrument or machine for separating bran from flour, or the coarser part of meal from the finer.
3. n. A kind of fishing-line.
4. To clot.
5. n. A machine for sawing logs into a size suitable for cutting into small strips. The pieces cut by a bolter are called bolts, and these bolts are sawed into laths, pickets, etc., in a gang-saw.
6. n. In archery, an archer who, after drawing the bow, looses too soon.

Wiktionary

1. n. A person or thing that bolts.
2. n. botany, horticulture A plant that grows larger and more rapidly than usual.
3. n. A machine or mechanism that automatically sifts milled flour.
4. n. A filter mechanism.
5. n. Australia, sports An obscure athlete who wins an upset victory.
6. n. Australia A horse that wins at long odds.
7. n. New Zealand, sports In team sports, a relatively little-known or inexperienced player who inspires the team to greater success.
8. n. US, politics A member of a political party who does not support the party's nominee.
9. n. A missed landing on an aircraft carrier; an aircraft that has made a missed landing.
10. n. A kind of fishing line; a boulter.

GNU Webster's 1913

1. n. One who bolts; esp.: (a) A horse which starts suddenly aside. (b) A man who breaks away from his party.
2. n. One who sifts flour or meal.
3. n. An instrument or machine for separating bran from flour, or the coarser part of meal from the finer; a sieve.
4. n. A kind of fishing line. See boulter.