sea snake

/S IY1 S N EY1 K/
noun
  1. 1

    Any of several snakes, of the subfamily Hydrophiinae, that live in the waters of the Pacific and Indian Oceans.

  2. 2

    Any snake that lives in the sea.

  3. 3

    A sea serpent.

Source: https://en.wiktionary.org/wiki/sea%20snake