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Noun: hard water  haa(r)d wo-tu(r)
  1. Water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap

Type of: H2O, water

Antonym: soft water

Encyclopedia: Hard water

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hard sign
hard solder
hard steel
hard subtitle
hard surface
hard tick
hard time
hard times
hard to please
hard up
hard water
hard wheat
hard worker
hard-and-fast
hard-ass
hardback
hardbacked
hardbake
hard-baked
hardball
hard-bitten