[mes-kuh-leen, -lin]
noun Pharmacology.
a white, water-soluble, crystalline powder, C 1 1 H 1 7 NO 3 , obtained from mescal buttons, that produces hallucinations.

1895–1900; mescal + -ine2

mescaline, mesclun. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mescaline or mescalin (ˈmɛskəˌliːn, -lɪn, ˈmɛskəˌliːn, -lɪn)
a hallucinogenic drug derived from mescal buttons. Formula: C11H17NO3
mescalin or mescalin

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

crystalline alkaloid, 1896, from Ger. mezcalin (1896), so called because it originally was found in the buttons that grow atop the mescal cacti (see mescal).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mescaline mes·ca·line (měs'kə-lēn', -lĭn)
An alkaloid drug obtained from buttons of a small cactus (Lophophora williamsii) that has hallucinatory effects.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
It took a mountain of amphetamine, mescaline, and cannabis to launch me into
  that space.
Subjects given lsd or mescaline would lie on mattresses, describing their
  visions into researchers' tape recorders.
Peyote is a small, spineless cactus in which the principal active ingredient is
The active ingredient in peyote is the hallucinogen mescaline.
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