1. Adjective.  (chemistry) of, relating to, or derived from nitrogen, especially in which the valence of the nitrogen is lower than that of a corresponding nitric species.
  2. Adjective.  (chemistry) of, or relating to nitrous acid or its derivatives.
  3. Adjective.  (mycology, biology) having a sharp odor like ammonia or nitric acid.
  4. Noun.  (dentistry, informal) Nitrous oxide.

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This entry was last updated on RefTopia from its source on 3/20/2012.