goat

n 1: any of numerous agile ruminants related to sheep but having a beard and straight horns syn caprine animal

2: a victim of ridicule or pranks syn butt, laughingstock, stooge

3: (astrology) a person who is born while the sun is in Capricorn syn Capricorn

4: the tenth sign of the zodiac; the sun is in this sign from about December 22 to January 19 syn Capricorn, Capricorn the Goat

Source: WordNet. Princeton University