- 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.
- to harden in spirit so as to render insensible or insensitive to external impressions or influences; make callous.
Origin of caseharden
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for case-harden
Many woods, however, check severely in air-drying or case-harden in the air.Seasoning of Wood
Joseph B. Wagner
- 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
- to harden the spirit or disposition of; make callousexperience 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