From WordNet (r) 3.0 (2006):
howl
n 1: a long loud emotional utterance; "he gave a howl of pain";
"howls of laughter"; "their howling had no effect" [syn:
howl, howling, ululation]
2: the long plaintive cry of a hound or a wolf
3: a loud sustained noise resembling the cry of a hound; "the
howl of the wind made him restless"
v 1: emit long loud cries; "wail in self-pity"; "howl with
sorrow" [syn: howl, ululate, wail, roar, yawl,
yaup]
2: cry loudly, as of animals; "The coyotes were howling in the
desert" [syn: howl, wrawl, yammer, yowl]
3: make a loud noise, as of wind, water, or vehicles; "The wind
was howling in the trees"; "The water roared down the chute"
[syn: roar, howl]
4: laugh unrestrainedly and heartily [syn: roar, howl]