Definition of "panther"

Any of various big cats with black fur; most especially, the black-coated leopard of India.  examples

Any big cat of the genus Panthera.  examples

A cougar; especially the Florida panther.  examples

(slang) A girl, especially a young one, who pursues older men.

(mythology, heraldry) A creature resembling a big cat, typically incensed (“emitting fire”), and often having a multicolored hide, found in Ancient Greek mythology and in medieval and later heraldry (in which its depiction sometimes approaches that of a horse).