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English

From Middle English crystal, cristal, criȝstall, from Old English cristalla (crystal), a borrowing from Latin crystallum (crystal, ice) (later reinforced from Anglo-Norman cristall and Middle French cristal, from Latin crystallum), from Ancient Greek κρύσταλλος (krústallos, clear ice), from κρύος (krúos, frost), from the Proto-Indo-European *krus-, *kru- (hard, hard outer surface, crust).