Lewis & Short

Caeneus (dissyl.), ĕos

    (
  1. I. gen., Stat. Th. 7, 644; voc. Caenĭ, Ov. M. 12, 470: Caeneu, id. ib. 12, 531), m., = Καινεύς, orig. a girl, named Cænis, Ov. M. 12, 189; 12, 195; 12, 201; 12, 470 sq., the daughter of Elatus, afterwards changed by Neptune into a boy, he was subsequently present at the Calydonian hunt. and at the contest of the Centaurs and Lapithæ, and finally was metamorphosed into a bird. Ov. M. 12, 189; 12, 459 sq.; 12, 514 sq.; Hyg. Fab. 14; acc. to Verg. he again became a female. Verg. A. 6, 448 Serv.
  2. II. A companion of Æneas, Verg. A. 9, 573.