'Billy goat' definitions:

Definition of 'billy goat'

From: WordNet
noun
Male goat [syn: billy, billy goat, he-goat]

Definition of 'Billy goat'

From: GCIDE
  • Billy goat \Bil"ly goat`\ A male goat. [Colloq.] [1913 Webster] billyo

Synonyms of 'billy goat'

From: Moby Thesaurus