Meaning of hardener

hard•en•er

Pronunciation: (här'dn-ur), [key]
— n.
  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. a chemical used to raise the melting point of an emulsion.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.