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English definition of “crystal”

crystal

noun (MINERAL)    /ˈkrɪs.təl/
[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.Mineralogy [C or U] clear, transparent rock that is used in jewellery, or a piece of this: a pair of crystal earringsPrecious and semi-precious stonesTypes of rock
(Definition of crystal noun (MINERAL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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