de•vit•ri•fyPronunciation: (dē-vi'tru-fī"), [key]
—v., -fied, -fy•ing.
to deprive, wholly or partly, of vitreous character or properties.
(of a volcanic rock or particle) to undergo a change in texture from glassy to crystalline.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.