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tr.v. case·hard·ened, case·hard·en·ing, case·hard·ens
1. To harden the surface or case of (iron or steel) by high-temperature shallow infusion of carbon followed by quenching.
2. To make callous or insensitive.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. to harden the surface of (an iron-based alloy) by carburizing and heat treatment, leaving the interior tough and ductile.
2. to make callous.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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