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caseharden

[keys-hahr-dn] /ˈkeɪsˌhɑr dn/
verb (used with object)
1.
Metallurgy. to make the outside surface of (an alloy having an iron base) hard by carburizing and heat treatment, leaving the interior tough and ductile.
2.
to harden in spirit so as to render insensible or insensitive to external impressions or influences; make callous.
Origin
1670-1680
1670-80; case2 + harden
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for case-harden

case-harden

verb (transitive)
1.
(metallurgy) to form a hard surface layer of high carbon content on (a steel component) by heating in a carburizing environment with subsequent quenching or heat treatment
2.
to harden the spirit or disposition of; make callous: experience had case-hardened the judge
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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