[ nahy-troh ]
/ ˈnaɪ troʊ /


Chemistry. containing the nitro group.


Origin of nitro

First recorded in 1855–60; see origin at nitro-

Definition for nitro (2 of 2)


a combining form used in the names of chemical compounds in which the nitro group is present: nitroglycerin.
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. 2019

Examples from the Web for nitro

British Dictionary definitions for nitro (1 of 2)


/ (ˈnaɪtrəʊ) /


slang short for nitroglycerine

British Dictionary definitions for nitro (2 of 2)


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

Medicine 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.