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crystal
noun
A protective cover that protects the face of a watch
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noun
A protective cover that protects the face of a watch
noun
Glassware made of quartz
noun
A crystalline element used as a component in various electronic devices
noun
A rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
noun
Colorless glass made of almost pure silica
noun
A solid formed by the solidification of a chemical and having a highly regular atomic structure
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