/ Dictionary / Index T transsonic: Meaning and Definition of Find definitions for: trans•son•ic Pronunciation: (trans-son'ik), [key] — adj. transonic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Trans-Siberian Railroad transubstantiate Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language