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.
Also especially before a vowel, benz-.

Origin of benzo- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for benzo-


sometimes before a vowel benz-

combining form

indicating a benzene ring fused to another ring in a polycyclic compoundbenzofuran
indicating derivation from benzene or benzoic acid or the presence of phenyl groupsbenzophenone

Word Origin for benzo-

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

Medicine definitions for benzo-



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