Pronunciation: (hou'lur),[key] —n. 1. a person, animal, or thing that howls.
2. Also called howl'er mon"key. any large, prehensile-tailed tropical American monkey of the genus Alouatta, the males of which make a howling noise: some species are endangered.
3. a mistake, esp. an embarrassing one in speech or writing, that evokes laughter; a very humorous mistake or a funny blunder.
4. Informal.something that makes a piercing and often prolonged noise, as an alarm.