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caseharden

[keys-hahr-dn]
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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 of caseharden

First recorded in 1670–80; case2 + harden
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for caseharden

Historical Examples

  • I have a peculiar kind of steel which I cannot harden by fire and water, neither will it caseharden by prussiate of potash.

    Scientific American, Vol. XXXIX.--No. 24. [New Series.], December 14, 1878

    Various