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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Nitrous \Ni"trous\, adjective [L. nitrosus full of natron: cf. F. nitreux. See {Niter}.]
1. Of, pertaining to, or containing, niter; of the quality of niter, or resembling it.
2. (Chem.) Of, pertaining to, or designating, any one of those compounds in which nitrogen has a relatively lower valence as contrasted with nitric compounds.
{Nitrous acid} (Chem.), a hypothetical acid of nitrogen {HNO2}, not known in the free state, but forming a well known series of salts, viz., the nitrites.
{Nitrous oxide}. See {Laughing gas}.
From WordNet (r) 2.0 [wn]:
nitrous
adjective: of or containing nitrogen; "nitric acid" [syn: {azotic}, {nitric}]
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