Main Entry: ¹crys·tal

Pronunciation: \ˈkris-t^əl\

Function: 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