/ Dictionary / Index T thumbkin: Meaning and Definition of Find definitions for: thumb•kin Pronunciation: (thum'kin), [key] — n. thumbscrew (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thumb index thumbnail 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