noun.
A South American monkey of the family Cebidœ and subfamily Mycetinœ: as, the ursine howler, Mycetes ursinus.
noun.
A calling device employed in telephony in place of the magnetic call-bell; a buzzer.
the GNU version of the Collaborative International Dictionary of English
noun.
One who howls.
noun.
Any South American monkey of the genus Mycetes. Many species are known. They are arboreal in their habits, and are noted for the loud, discordant howling in which they indulge at night.