The Collaborative International Dictionary of English v.0.48:

Fulminating \Ful"mi*na"ting\, a.
   1. Thundering; exploding in a peculiarly sudden or violent
      manner.
      [1913 Webster]

   2. Hurling denunciations, menaces, or censures.
      [1913 Webster]

   Fulminating oil, nitroglycerin.

   Fulminating powder (Chem.) any violently explosive powder,
      but especially one of the fulminates, as mercuric
      fulminate.
      [1913 Webster]