/ Dictionary / Index T thumbnut: Meaning and Definition of Find definitions for: thumb•nut Pronunciation: (thum'nut"), [key] — n. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thumbnut (Thesaurus) thumbnail thumb piano Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language