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]
William Smith. A Dictionary of Greek and Roman biography and mythology. London. John Murray: printed by Spottiswoode and Co., New-Street Square and Parliament Street. In the article on Soranus, we find: "at this present time (1848)" and this date seems to reflect the dates of works cited. 1873 - probably the printing date.