/ Dictionary / Index T triethyl: Meaning and Definition of Find definitions for: tri•eth•yl Pronunciation: (trī-eth'ul), [key] — adj. Chem. containing three ethyl groups. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Trieste triethylamine Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language