from The Century Dictionary.

  • Used only in the following name:

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Chem.) Containing or derived from nitrogen having a lower valence than in nitrous compounds.
  • adjective (Chem.) an unstable nitrogen acid, NOH, whose salts are produced by reduction of the nitrates, although the acid itself is not isolated in the free state except as a solution in water; -- called also nitrosylic acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Of or pertaining to hyponitrous acid or its derivatives


from Wiktionary, Creative Commons Attribution/Share-Alike License

hypo- +‎ nitrous


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