(ˈ)dē+ verb
Etymology: French dévitrifier, from dé- de- (from Old French des- ) + vitrifier to vitrify
transitive verb
: to deprive of glassy luster and transparency ; especially : to change (as a glass, glassy rock, or enamel) from a vitreous to a crystalline condition
intransitive verb
: to change from a vitreous to a crystalline condition usually with loss of transparency and luster