hardener Hear it!

hardener definition

hard·ener (härd′'n ər)

noun

a person or thing that hardens; specif.,
  1. a person who tempers metal tools
  2. a substance added to paint, varnish, etc. to give it a harder film

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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