Ixionides

a patronymic, applied by Ovid (Ov. Met. 8.566) to Peirithous, the son of Ixion ; but the plural, Ixionidae, occurs also as a name of the Centaurs. (Lucan, 6.386.) [L.S]

A patronymic applied to Pirithoüs, the son of Ixion (q.v.). The Centaurs are also called Ixionidae (Lucan, vi. 386).