[thee-buh-een, thi-bey-een, -in]
noun Chemistry.
a white, crystalline, slightly water-soluble, poisonous alkaloid, C 19 H 21 NO 3 , present in opium in small quantities, but having a strychninelike rather than a narcotic effect.

1890–95; < Neo-Latin thēba(ia) opium of Thebes, Egypt (alteration of Latin Thēbaea, feminine of Thēbaeus Theban) + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thebaine (ˈθiːbəˌiːn, θɪˈbeɪiːn, -aɪn)
Also called: paramorphine a poisonous white crystalline alkaloid, found in opium but without opioid actions. Formula: C19H21NO3
[C19: from New Latin thebaia opium of Thebes (with reference to Egypt as a chief source of opium) + -ine²]

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American Heritage
Medical Dictionary

thebaine the·ba·ine (thē'bə-ēn', thĭ-bā'ĭn)
A poisonous crystalline alkaloid obtained from opium. Also called paramorphine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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