Hardener definitions

här'dn-ər
One that hardens, especially a substance added to varnish or paint to give it a harder surface or finish.
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A person or thing that hardens something.
  • A person who tempers metal tools.
  • A substance added to paint, varnish, etc. to give it a harder film.
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One who, or that which, hardens.

The hardener of hearts.

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A chemical substance added to something in order to harden it; used especially with paints, varnishes and resins.
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Origin of hardener

harden +‎ -er