softener

Noun
  1. A substance added to another to make it less hard (synset 115080503)
    is a type of: chemical, chemical substance - material produced by or used in a reaction involving changes in atoms or molecules
    subtypes:
    • conditioner - a substance used in washing (clothing or hair) to make things softer
    • plasticiser, plasticizer - a substance added to plastics or other materials to make them more pliable
    • water softener - a substance (such as sodium chloride) that lessens the hardness of water by replacing calcium and magnesium ions with sodium ions and so gives the water more efficient sudsing power

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