seawater

/S IY1 W AA0 T ER0/
noun
  1. 1

    The saltwater of a sea or ocean.

adjective
  1. 1

    Consisting of seawater.

  2. 2

    Associated in some way with seawater, or intended for dealing with seawater.

    โ€œAboard the ship we needed seawater soap for washing our clothesโ€

Source: https://en.wiktionary.org/wiki/seawater