yowl(noun, verb) noun1. a very loud utterance (like the sound of an animal)Similar word(s): bellow, bellowing, holla, holler, hollering, hollo, holloa, roar, roaringDefinition categories: communication, call, cry, outcry, shout, vociferation, yell verb1. cry loudly, as of animalsSimilar word(s): howl, wrawl, yammerDefinition categories: communication, emit, utter2. utter shrieks, as of catsSimilar word(s): caterwaulDefinition categories: communication, pipe, shriek, shrill