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benzo-

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  1. a combining form used in the names of chemical compounds in which benzene, benzoic acid, or one or more of the phenyl groups is present: benzocaine.
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Also especially before a vowel, benz-.

Origin of benzo-

benz(ene) or benz(oic) + -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for benzo-

benzo-

sometimes before a vowel benz-

combining form
  1. indicating a benzene ring fused to another ring in a polycyclic compoundbenzofuran
  2. indicating derivation from benzene or benzoic acid or the presence of phenyl groupsbenzophenone
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Word Origin

from benzoin
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
benzo- in Medicine

benzo-

pref.
  1. Benzene; benzoic acid:benzodiazepine.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.