The Collaborative International Dictionary of English v.0.48:

Fulmination \Ful"mi*na`tion\, n. [L. fulminatio a darting of
   lightning: cf. F. fulmination.]
   1. The act of fulminating or exploding; detonation.
      [1913 Webster]

   2. The act of thundering forth threats or censures, as with
      authority.
      [1913 Webster]

   3. That which is fulminated or thundered forth; vehement
      menace or censure.
      [1913 Webster]

            The fulminations from the Vatican were turned into
            ridicule.                             --Ayliffe.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fulmination
    n 1: thunderous verbal attack [syn: fulmination, diatribe]
    2: the act of exploding with noise and violence; "his
       fulminations frightened the horses"