[ thee-buh-een, thi-bey-een, -in ]
/ ˈθi bəˌin, θɪˈbeɪ in, -ɪn /
Save This Word!

noun Chemistry.

a white, crystalline, slightly water-soluble, poisonous alkaloid, C19H21NO3, present in opium in small quantities, but having a strychninelike rather than a narcotic effect.



Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Meet Grammar Coach

Write or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing

Meet Grammar Coach

Improve Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of thebaine

1890–95; <New Latin thēba(ia) opium of Thebes, Egypt (alteration of Latin Thēbaea, feminine of Thēbaeus Theban) + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for thebaine

  • Chloroform dissolves thebaine with difficulty out of both acid and alkaline solutions; petroleum ether extracts it from neither.

British Dictionary definitions for thebaine

/ (ˈθiːbəˌiːn, θɪˈbeɪiːn, -aɪn) /


a poisonous white crystalline alkaloid, found in opium but without opioid actions. Formula: C 19 H 21 NO 3Also called: paramorphine

Word Origin for thebaine

C19: from New Latin thebaia opium of Thebes (with reference to Egypt as a chief source of opium) + -ine ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for thebaine

[ thēbə-ēn′, thĭ-bāĭn ]


A poisonous crystalline alkaloid obtained from opium.paramorphine
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.