/ Dictionary / Index T transilluminate: Meaning and Definition of Find definitions for: trans•il•lu•mi•nate Pronunciation: (trans"i-l'mu-nāt", tranz"-), [key] — -nat•ed, -nat•ing. to cause light to pass through. to throw a strong light through (an organ or part) as a means of diagnosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. transilient transistor Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language