/ Dictionary / Index T thiosulfate: Meaning and Definition of Find definitions for: thi•o•sul•fate Pronunciation: (thī"ō-sul'fāt), [key] — n. Chem. a salt or ester of thiosulfuric acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thiosinamine thiosulfuric 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