/ Dictionary / Index T triacetate fiber: Meaning and Definition of Find definitions for: triac'etate fi"ber Pronunciation: [key] a textile fiber made of cellulose triacetate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triacetate triacid 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