Hardener

//ˈhɑɹdn̩ɚ// noun

Definitions

Noun
  1. 1
    One who, or that which, hardens.

    "the hardener of hearts"

  2. 2
    one that hardens, especially a substance added to varnish or paint to give it a harder surface or finish. wordnet
  3. 3
    A chemical substance added to something in order to harden it; used especially with paints, varnishes and resins.

Etymology

From harden + -er.

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