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

1605–15; harden + -er1

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World English Dictionary
hardener (ˈhɑːdənə)
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 10th Edition
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Example sentences
Mix some marine plastic with a few drops of hardener, remembering that the more hardener you use the faster the plastic hardens.
Samples shall be taken prior to the addition of the hardener powder.
These releases were primarily from copper rolling and drawing industries which use it as a hardener in alloys.
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