/ Dictionary / Index T triacid: Meaning and Definition of Find definitions for: tri•ac•id Pronunciation: (trī-as'id), [key] — adj. Chem. capable of combining with three molecules of a monobasic acid: a triacid base. noting acid salts containing three replaceable hydrogen atoms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triacetate fiber triacontanol Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language