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hardboard
hardboot
hardbound
hardcover
hardears
harden
harden off
hardened
hardener
hardening of the arteries
hardhack
hardhanded
hardhat
hardhead
hardheaded
hardhearted
hardihood
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hardener
hard·en·er [ hrd'nər ]


noun 
Definition:
 
hardening agent: an ingredient or element that makes something hard, e.g. a substance added to paint to make it more durable
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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