howler Syllabification: (howl·er)Pronunciation: /ˈhoulər/Translate howler | into German | into Italian Definition of howler noun 1 informal a stupid or glaring mistake, especially an amusing one. 2 (also howler monkey) a fruit-eating monkey with a prehensile tail and a loud howling call, native to the forests of tropical America. Genus Alouatta, family Cebidae: several species howler in other Oxford dictionaries Definition of howler in the British & World English dictionary