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[bee-zawr, -zohr] /ˈbi zɔr, -zoʊr/
a calculus or concretion found in the stomach or intestines of certain animals, especially ruminants, formerly reputed to be an effective remedy for poison.
Obsolete. a counterpoison or antidote.
Origin of bezoar
1470-80; earlier bezear < Medieval Latin bezahar < Arabic (di)zahr < Persian pād-zahr counterpoison; -o- < New Latin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for bezoar


a hard mass, such as a stone or hairball, in the stomach and intestines of animals, esp ruminants, and man: formerly thought to be an antidote to poisons
Word Origin
C15: from Old French bézoard, from Arabic bāzahr, from Persian bādzahr, from bād against + zahr poison
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
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Word Origin and History for bezoar

late 15c., ultimately from Arabic bazahr, from Persian pad-zahr "counter-poison," from pad "protecting, guardian, master" (from Iranian *patar-, cf. Avestan patar-, from PIE *pa-tor-, from root *pa- "to protect, feed") + zahr "poison" (from Old Iranian *jathra, from PIE *gwhn-tro-, from root *gwhen- "to strike, kill;" see bane). Originally "antidote," later specifically in reference to a concoction from solid matter found in the stomachs and intestines of ruminants, which was held to have antidotal qualities (1570s).

Online Etymology Dictionary, © 2010 Douglas Harper
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bezoar in Medicine

bezoar be·zoar (bē'zôr')
A hard indigestible mass of material, such as hair, vegetable fibers, or the seeds and skins of fruits, formed in the alimentary canal.

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