crystal - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “crystal”

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crystal

noun  us   /ˈkrɪs·təl/

crystal noun (ROCK)

[C/U] transparent rock that looks like ice, or a piece of it

crystal noun (GLASS)

[C/U] transparent glass of high quality, usually with its surface cut into patterns that reflect light [C/U] A crystal is a transparent glass or plastic cover for a watch or clock.

crystal noun (REGULAR SHAPE)

science [C] the solid state of many simple substances, which have a regular shape and surfaces arranged in similar patterns
(Definition of crystal from the Cambridge Academic Content Dictionary © Cambridge University Press)
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