from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A horse given to bolting.
- n. One who gives up membership in or withdraws support from a political party.
- n. A machine used for sifting, especially for sifting flour.
- n. One who operates a sifting machine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A person or thing that bolts.
- n. A plant that grows larger and more rapidly than usual.
- n. A machine or mechanism that automatically sifts milled flour.
- n. A filter mechanism.
- n. An obscure athlete who wins an upset victory.
- n. A horse that wins at long odds.
- n. In team sports, a relatively little-known or inexperienced player who inspires the team to greater success.
- n. A member of a political party who does not support the party's nominee.
- n. A missed landing on an aircraft carrier; an aircraft that has made a missed landing.
- n. A kind of fishing line; a boulter.
from the GNU version of the Collaborative International Dictionary of English
- n. One who bolts; esp.: (a) A horse which starts suddenly aside. (b) A man who breaks away from his party.
- n. One who sifts flour or meal.
- n. An instrument or machine for separating bran from flour, or the coarser part of meal from the finer; a sieve.
- n. A kind of fishing line. See boulter.
from The Century Dictionary and Cyclopedia
- n. One who bolts, in any sense of the verb.
- n. A sieve; an instrument or machine for separating bran from flour, or the coarser part of meal from the finer.
- n. A kind of fishing-line.
- To clot.
- 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.
- n. In archery, an archer who, after drawing the bow, looses too soon.
From bolt + -er. (Wiktionary)