To convert glass from an amorphous (glassy) state into a crystalline state, causing it to become opaque and brittle.
From de- (reversal) + vitrify (to make glass). The opposite of vitrification in the glass-making process.
This is the enemy of glass-makers—while they're desperately trying to create perfect glass, impurities and slow cooling cause devitrification, which ruins the final product by making it cloudy and weak.
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