devitrify

from WordNet (r) 3.0 (2006)
devitrify
    v 1: become crystalline
    2: make (glassy materials) brittle or opaque
    
from The Collaborative International Dictionary of English v.0.48
Devitrify \De*vit"ri*fy\, v. t.
   To deprive of glasslike character; to take away vitreous
   luster and transparency from.
   [1913 Webster]
    

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