hydrus | -os (noun M) = ὕδρος: or
* A water-serpent, serpent (cf.: chelydrus, chersydrus, anguis, serpens).
* Lit., Plin. 29, 4, 22, § 72; Verg. G. 4, 458; id. A. 7, 753; Ov. M. 13, 804: marini,Plin. 6, 23, 26, § 98. In the hair of the Furies, of Medusa, etc., Verg. A. 7, 447; Val. Fl. 2, 195; Ov. M. 4, 800; hence poet. transf.: nam si Vergilio puer et tolerabile desit Hospitium, caderent omnes a crinibus hydri, i. e. all his poetic fire would have come to naught (referring to his description of the Furies, A. 7, 415 and 447), Juv. 7, 70.
* Transf.
* The poison of a serpent, Sil. 1, 322.
* Hydros, i, the constellation of the Waterserpent, called also Anguis and Hydra, German. Arat. 429.

s. TLL