/ Dictionary / Index T thrasher: Meaning and Definition of Find definitions for: thrash•er Pronunciation: (thrash'ur), [key] — n. a person or thing that thrashes. any of several long-tailed, thrushlike birds, esp. of the genus Toxostoma, related to the mockingbirds. Cf. thresher (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thrasher (Thesaurus) thrash thrashing Related Content Daily Word Quiz: ravenous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language