DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   HN \HN\ n.
      a colorless explosive liquid that is volatile, poisonous, and
      foul-smelling.
      Syn: hydrazoic acid, azoimide.
           [WordNet 1.5]