/ Dictionary / Index B billy goat: Meaning and Definition of Find definitions for: bil'ly goat" Pronunciation: [key] a male goat. goat (def. 6). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. billycock Billy the Kid Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language