THESAURUS
ossify
anneal, brutalize, calcify, callous, case harden, cornify, firm, fossilize, harden, indurate, inure, lapidify, lithify, petrify, steel, temper, toughen, vitrify
ROGET THESAURUS
ossify
Hardness
VB
render hard, harden, stiffen, indurate, petrify, temper,
ossify, vitrify, accrust.