Definition of water serpent in English:

water serpent

Pronunciation /ˈwɔːtə ˌsəːp(ə)nt/

noun

  • 1A sea serpent or other mythical aquatic creature. Formerly also: a water snake or sea snake.

  • 2Astronomy
    With capital initials. The southern constellation Hydra.

Origin

Mid 16th century; earliest use found in John Palsgrave (d. 1554), teacher and scholar of languages. From water + serpent.