thresher

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

• noun One that threshes.
• noun A threshing machine.
• noun A thresher shark.

from The Century Dictionary.

• noun See thrasher.
• noun One who threshes: in this and the next sense commonly thresher.
• noun A threshing-machine.
• noun A sea-fox; a kind of shark, Alopias vulpes, so called from the enormous length of the upper division of the heterocercal tail, with which it threshes the water. See cut under Alopias. In this sense more commonly thrasher.
• noun A member of an Irish Catholic organization instituted in 1806.

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

• noun Same as thrasher.

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

• noun agriculture Anything or anyone that threshes.
• noun agriculture, obsolete A now-obsolete hand tool for threshing, also called a flail.
• noun agriculture A modern farm machine for threshing grain, now a part of combine harvesters rather than a separate implement.

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

• noun large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed
• noun a farm machine for separating seeds or grain from the husks and straw