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2 definitions found
 for nitrous
From The Collaborative International Dictionary of English v.0.48 :

  Nitrous \Ni"trous\, a. [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.
        [1913 Webster]
     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.
        [1913 Webster]
     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.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adj 1: of or containing nitrogen; "nitric acid" [syn: azotic,
             nitric, nitrous]

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