softener

[saw-fuh-ner, sof-uh-]
noun
1.
Chemistry.
a.
any admixture to a substance for promoting or increasing its softness, smoothness, or plasticity.
2.
a person or thing that softens.

Origin:
1600–10; soften + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
softener (ˈsɒfənə)
 
n
1.  a substance added to another substance to increase its softness, pliability, or plasticity
2.  a substance, such as a zeolite, for softening water

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It is also an effective deodorizer and water softener that enhances the
  cleaning powder of soap.
The plastic is a resin of the kind used to pull calcium out of water in a water
  softener.
Vending machines dispensing boxes of detergent and softener are available.
Use liquid fabric softener and hot water to remove old wallpaper.
Image for softener
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