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Meaning of “crystal” in the English Dictionary

"crystal" in British English

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crystalnoun

uk   /ˈkrɪs.təl/  us   /ˈkrɪs.təl/
  • crystal noun (GLASS)

C2 [U] transparentglass of very high ​quality, usually with ​itssurfacecut into ​delicatepatterns: a crystal ​vase
[C] US a ​transparentglass or ​plasticcover for a ​watch or ​clock

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  • crystal noun (MINERAL)

[C] a ​piece of a ​substance that has ​becomesolid, with a ​regularshape: When ​seawater is ​allowed to ​evaporate, ​salt crystals are ​deposited. Cirrus ​clouds are ​composed of ​ice crystals.
[C or U] clear, ​transparentrock that is used in ​jewellery, or a ​piece of this: a ​pair of crystal ​earrings
(Definition of crystal from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"crystal" in American English

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crystalnoun

 us   /ˈkrɪs·təl/
  • crystal noun (ROCK)

[C/U] transparentrock that ​looks like ​ice, or a ​piece of it
  • crystal noun (GLASS)

[C/U] transparentglass of high ​quality, usually with ​itssurfacecut into ​patterns that ​reflectlight
[C/U] A crystal is a ​transparentglass or ​plasticcover for a ​watch or ​clock.
  • crystal noun (REGULAR SHAPE)

science [C] the ​solidstate of many ​simplesubstances, which have a ​regularshape and ​surfacesarranged in ​similarpatterns
(Definition of crystal from the Cambridge Academic Content Dictionary © Cambridge University Press)
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“crystal” in British English

There, their and they’re – which one should you use?
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