/ Dictionary / Index T thebaine: Meaning and Definition of Find definitions for: the•ba•ine Pronunciation: (thē'bu-ēn", thi-bā'ēn, -in), [key] — n. Chem. a white, crystalline, slightly water-soluble, poisonous alkaloid, CHNO, present in opium in small quantities, but having a strychninelike rather than a narcotic effect. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Thebaid thebe Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language