What is "chrysaor"

In Greek mythology, Chrysaor (, gen.: Χρυσάορος; English translation: "He who has a golden sword" (from χρυσός, "golden" and ἄορ, "sword")), the brother of the winged horse Pegasus, was often depicted as a young man, the son of Poseidon and the Gorgon Medusa. Chrysaor and Pegasus were not born until Perseus chopped off Medusa's head.