/ Dictionary / Index T thro: Meaning and Definition of Find definitions for: thro Pronunciation: (thr), [key] — prep. Archaic. through. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thrive throat Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language