D defs.my
Entry 2 senses Webster, 1913

Howler

/houl'-ẽr/ · Howl·er · IPA /ˈhaʊlɚ/
01 n. One who howls.
  1. 1.
    One who howls.
  2. 2.
    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.(Zool.)