adjective Chemistry.
pertaining to compounds obtained from niter, usually containing less oxygen than the corresponding nitric compounds.
containing nitrogen, usually in the trivalent state.

1595–1605; < Latin nitrōsus full of natron. See nitroso-

nonnitrous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nitrous (ˈnaɪtrəs)
of, derived from, or containing nitrogen, esp in a low valency state
[C17: from Latin nitrōsus full of natron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

nitrous ni·trous (nī'trəs)
Of, derived from, or containing nitrogen, especially in a valence state lower than that in a comparable nitric compound.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nitrous   (nī'trəs)  Pronunciation Key 
Containing nitrogen, especially nitrogen with a valence of 3. Compare nitric.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
More than three-quarters of agriculture's nitrous oxide emissions result from
  manmade fertilizers.
The motors burn an unusual fuel: a combination of recycled rubber and nitrous
Among the gases available for inhaling was nitrous oxide.
What a gamma ray burst would do is to ionize the upper atmosphere, which would
  then recombine to form nitrous oxides.
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