crystal

I. noun Etymology: Middle English cristal, from Anglo-French, from Latin crystallum, from Greek krystallos — more at crust Date: 13th century 1. quartz that is transparent or nearly so and that is either colorless or only slightly tinged 2. something resembling crystal in transparency and colorlessness 3. a body that is formed by the solidification of a chemical element, a compound, or a mixture and has a regularly repeating internal arrangement of its atoms and often external plane faces 4. a clear colorless glass of superior quality; also objects or ware of such glass 5. the glass or transparent plastic cover over a watch or clock dial 6. a crystalline material used in electronics as a frequency-determining element or for rectification 7. ice 7; broadly methamphetamine in any form when used illicitly II. adjective Date: 14th century 1. consisting of or resembling crystal ; clear, lucid 2. relating to or using a crystal <

a crystal radio receiver

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