ὕδρος

A. water-snake, Coluber natrix, Il. 2.723, Hdt. 2.76, Arist. HA 487a23, 508b1; λευκὸς ὡς ὕδρου γαστήρ Call. Iamb. 1.218 ( = εἶδος δράκοντος, Sch. in mg.).

II. a small water-animal, = φαλάγγιον or σαῦρος, Artem. 4.56.

III. the constellation Hydra, Eudox. ap. Hipparch. 2.2.13. (Cf. Skt. udrás, OE. oter 'otter'.)