'HN' definitions:

Definition of 'HN'

(from WordNet)
noun
A colorless explosive liquid that is volatile and poisonous and foul-smelling [syn: hydrazoic acid, azoimide, hydrogen azide, HN]

Definition of 'HN'

From: GCIDE
  • HN \HN\ n. a colorless explosive liquid that is volatile, poisonous, and foul-smelling.
  • Syn: hydrazoic acid, azoimide. [WordNet 1.5]