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English definition of “crystal”

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crystal

noun uk   /ˈkrɪs.təl/ us  

crystal noun (GLASS)

C2 [U] transparent glass of very high quality, usually with its surface cut into delicate patterns: a crystal vase [C] US a transparent glass or plastic cover for a watch or clock
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crystal noun (MINERAL)

[C] a piece of a substance that has become solid, with a regular shape: When sea water is allowed to evaporate, salt crystals are deposited. Cirrus clouds are composed of ice crystals. [C or U] clear, transparent rock that is used in jewellery, or a piece of this: a pair of crystal earrings
(Definition of crystal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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