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Verb: devitrify  dee'vi-tru,fI
  1. Become crystalline
    "The volcanic glass began to devitrify over time"
     
  2. Make (glassy materials) brittle or opaque
    "Prolonged exposure to heat devitrified the glass surface"

Derived forms: devitrified, devitrifying, devitrifies

Type of: crystalize [US, rare], crystallise [Brit], crystallize, effloresce, embrittle