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crystal

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crystal/ˈkrɪstl̟/noun
pluralcrystals
crystal
/ˈkrɪstl̟/
noun
pluralcrystals
Learner's definition of CRYSTAL  
[count]  : a small piece of a substance that has many sides and is formed when the substance turns into a solid
: a clear hard mineral that is either colorless or very light in color and that is used in making jewelry
[noncount]
[count]
[noncount] 
: a special type of glass that is very clear — often used before another noun
   b  : objects made of this glass
[count]US  : the clear glass or plastic cover on a watch or clock
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