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a combining form used in the names of chemical compounds in which the nitro group is present:
Also, especially before a vowel, nitr-.
Origin of nitro-
combining form of Greek nítron. See niter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for nitro-


combining form
indicating that a chemical compound contains a nitro group, -NO2: nitrobenzene
indicating that a chemical compound is a nitrate ester: nitrocellulose
Word Origin
from Greek nitronnatron
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 nitro-

before vowels nitr-, word-forming element used scientifically and indicating "nitrogen, nitrate" or "nitric acid," from comb. form of Greek nitron (see nitre).

Online Etymology Dictionary, © 2010 Douglas Harper
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nitro- in Medicine

nitro- or nitr-

  1. Nitrate; nitrogen: nitrogenase.

  2. 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.
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