What does "mythical" mean?

Mythical: Of or relating to myths; described in a myth; of the nature of a myth; fabulous; imaginary; fanciful. -- Myth"ic*al*ly, adv. The mythic turf where danced the nymphs. Mrs. Browning. Hengist and Horsa, Vortigern and Rowena, Arthur and Mordred, are mythical persons, whose very existence may be questioned. Macaulay.