ATERGATIS, in Mythology, a goddess of the Syrians, supposed to be Derecto, the mother of Semiramis. She was represented with the face and breasts of a woman, but the rest of her body resembled a fish. It has been conjectured that she is perhaps the female counterpart to the Dagon of the Philistines.—See Lucian, De Dea Syria, xiv.; Diodorus, ii.