/ Dictionary / Index T thumbhole: Meaning and Definition of Find definitions for: thumb•hole Pronunciation: (thum'hōl"), [key] — n. a hole into which a thumb can be inserted, as to provide a grip. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thumbhole (Thesaurus) thumb glass thumb index Related Content Daily Word Quiz: wizened Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language