Devitrify

[di:'vi:trifai]

(verb.) make (glassy materials) brittle or opaque.

(verb.) become crystalline.

Checker: Sandra--From WordNet

(v. t.) To deprive of glasslike character; to take away vitreous luster and transparency from.

Editor: Lois

v.t. to take away or greatly diminish the vitreous quality of.—n. Devitrificā′tion loss or diminution of the vitreous nature.

Checker: Sylvia