Source : Webster's Revised Unabridged Dictionary (1913)

Ululation \Ul`u*la"tion\, n. [L. ululatio.]
   A howling, as of a dog or wolf; a wailing.

         He may fright others with his ululation. --Wither.

Source : WordNet®

ululation
     n : a long loud emotional utterance; "he gave a howl of pain";
         "howls of laughter"; "their howling had no effect" [syn:
         {howl}, {howling}]