| 1. | a person, animal, or thing that howls. |
| 2. | Also called howler monkey. 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. |