adj
saltwater
adj
1
Consisting of or living in water that contains salt, such as the sea, as opposed to fresh water.
"The aquarium had a separate tank for saltwater fish."
How to Use Saltwater
Learner’s notesIn plain EnglishRelating to seawater rather than the fresh water of rivers and lakes.
Common pairings
saltwater fish
saltwater pool
saltwater crocodile
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Etymology
A straightforward compound of salt and water, used in English since the Middle Ages.