Lewis & Short

† 1. cȳ̆cnus (in MSS. and edd. freq. also cȳ̆gnus; y, Hor. C. 4, 3, 20; Aus. Ep. 20, 8), i, m., = κύκνος, the swan; celebrated for its singing, esp. for its dying song; consecrated to Apollo, Cic. Tusc. 1, 30, 73; Plin. 10, 23, 32, § 63; Lucr. 4, 181; 4, 910; Verg. E. 7, 38; id. A. 1, 393; Ov. M. 5, 387; Hor. C. 4, 3, 20 et saep.; attached to the chariot of Venus, Ov. M. 10, 708; id. A. A. 3, 809.

      1. b. Prov.: quid contendat hirundo cycnis? Lucr. 3, 7; so also: certent cycnis ululae, Verg. E. 8, 55.
  1. B. Meton., for a poet: Dircaeus, i. e. Pindar, Hor. C. 4, 2, 25.