views updated Jun 08 2018

thresh·er / ˈ[unvoicedth]reshər/ • n. 1. a person or machine that separates grain from the plants by beating. 2. (also thresher shark) a surface-living shark (Alopias vulpinus, family Alopidae) with a long upper lobe to the tail. Threshers often hunt in pairs, lashing the water with their tails to herd fish into a tightly packed shoal.