- Of, relating to, living in, or consisting of water that is not salty.
- Water with salinity less than 0.5‰ (parts per thousand) dissolved salts.
- Water that contains less than 1,000 milligrams per liter (mg/l) of dissolved solids; generally, more than 500 mg/l of dissolved solids is undesirable for drinking and many industrial uses.
- (Nautical) Accustomed to sailing on inland waters only as a fresh water sailor.
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