Hyponitrous acid Meaning, Definition & Usage

  1. noun an explosive white crystalline weak acid (H2N2O2)

WordNet

Definitions
  1. (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.

Webster 1913