a combining form used in the names of chemical compounds in which the nitro group is present: nitroglycerin.


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Also especially before a vowel, nitr-.

Origin of nitro-

combining form of Greek nítron. See niter Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for nitro-


before a vowel nitr-

combining form

indicating that a chemical compound contains a nitro group, -NO 2nitrobenzene
indicating that a chemical compound is a nitrate esternitrocellulose

Word Origin for nitro-

from Greek nitron natron
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 nitro-



Nitrate; nitrogen:nitrogenase.
Containing the univalent radical NO2:nitrous.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.