thresher

(agriculture) Anything or anyone that threshes.

(agriculture, historical) A now-obsolete hand tool for threshing, also called a flail.

(agriculture) A modern farm machine for threshing grain, now a part of combine harvesters rather than a separate implement.

(zoology) Any of several large pelagic sharks of the genus Alopias, which have a very long tail; more commonly called thresher sharks.