/ Dictionary / Index T thumb glass: Meaning and Definition of Find definitions for: thumb' glass" Pronunciation: [key] a drinking glass having external indentations to allow it to be firmly grasped. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thumber thumbhole Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language