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hardener

[ hahr-dn-er ]

noun

  1. a person or thing that hardens.
  2. a substance mixed with paint or other protective covering to make the finish harder or more durable.
  3. Photography. a chemical used to raise the melting point of an emulsion.


ˈhardener

/ ˈhɑːdənə /

noun

  1. a person or thing that hardens
  2. a substance added to paint or varnish to increase durability
  3. an ingredient of certain adhesives and synthetic resins that accelerates or promotes setting
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of hardener1

First recorded in 1605–15; harden + -er 1
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Example Sentences

Research specialist Alex Baer painted the greenhouse’s exterior with several coats of whitewash mixed with a hardener to block the sun’s rays and help the coating withstand winter rainstorms.

Mix the resin and hardener and press the mixture into the screw holes with a putty knife.

The hardener, sold separately, is $6.99 for a .37-ounce tube.

You’d have to mix its two thick components — a polyamide hardener and an epoxy resin — and then carefully try to get it into the crack without making a mess.

A kit with four ounces of resin and four ounces of hardener costs $17.99 at rockler.com.

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hardenedhardening