HyperDic: hard_water

English > 1 sense of the expression hard water:
NOUNsubstancehard waterwater that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap
English > hard water: 1 sense > noun 1, substance
Meaningwater that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap.
Broaderwater, H2Obinary compound that occurs at room temperature as a clear colorless odorless tasteless liquid / liquid
Oppositesoft waterwater that is not hard (does not contain mineral salts that interfere with the formation of lather with soap)
Catalanduresa de l'aigua

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