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Definition of "hardener" [hard•en•er]

  • One that hardens, especially a substance added to varnish or paint to give it a harder surface or finish. (noun)
  • A person or thing that hardens (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • A substance added to paint or varnish to increase durability (noun)
  • An ingredient of certain adhesives and synthetic resins that accelerates or promotes setting (noun)

www.Collinsdictionary.com (c) HarperCollins Publishers Ltd 2016

Use "hardener" in a sentence
  • "Bondo is a sort of goop, mixed from polyester resin and a hardener, that is used to fill in dents and dings in battered race cars."
  • "He acknowledged that there are times when he uses a performance-enhancing substance: nail hardener."
  • "It comes in two tubes, one with steel dust and then a hardener."