/ Dictionary / Index T thiacetic acid: Meaning and Definition of Find definitions for: thi'a•ce'tic ac'id Pronunciation: (thī'u-sē'tik, -u-set'ik, thī"-), [key] — Chem. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thi- thiamine Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language