/ Dictionary / Index T thiazine: Meaning and Definition of Find definitions for: thi•a•zine Pronunciation: (thī'u-zēn", -zin), [key] — n. Chem. any of a class of compounds containing a ring composed of one atom each of sulfur and nitrogen and four atoms of carbon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thiazine (Thesaurus) thiazide thiazole Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language