/ Dictionary / Index T thiol: Meaning and Definition of Find definitions for: thi•ol Pronunciation: (thī'ôl, -ol), [key] — Chem. Chem. —n. mercaptan. —adj. mercapto. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Thiokol thionic Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language