| Noun | 1. | Celtic deity - a deity worshipped by the Celts deity, divinity, god, immortal - any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force Fomor, Fomorian - one of a group of Celtic sea demons sometimes associated with the hostile power of nature Llew Llaw Gyffes - son of Gwydion and Arianrhod; supported by magic of Gwydion; cursed by Arianrhod Tuatha De, Tuatha De Danann - race of Celtic gods or demigods; ruled Ireland in the Golden Age |