海かい水すい

noun

seawater; sea water; saltwater from the sea

Refers specifically to naturally salty water from the sea or ocean. Although it can be translated as “saltwater,” artificially salted water is more often 塩水.

• 海かい水すいを飲のむと、かえって喉のどが渇かわく。

  If you drink seawater, you actually get thirstier.

• この魚さかなは海かい水すいで育そだつ。

  This fish grows in seawater.