hard water

Noun
  1. Water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap (synset 114929573)
    is a type of: h2o, water - binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent

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