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English definition of “crystal”

crystal

noun (GLASS)    /ˈkrɪs.təl/
C2 [U] transparent glass of very high quality, usually with its surface cut into delicate patterns: a crystal vaseGlass [C] US a transparent glass or plastic cover for a watch or clockWatches and clocksLids, covers and stoppers
(Definition of crystal noun (GLASS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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