Longman Dictionary of Contemporary English homepage

Topic: CHRONOLOGY

Date: 1000-1100
Language: Old French
Origin: cristal, from Latin crystallum, from Greek krystallos 'ice, crystal'

crystal

noun
     
crystal
crys‧tal
1 [uncountable]TIG very high quality clear glass:
a set of six crystal glasses
2 [countable]HEG a small regular-shaped piece of a substance, formed naturally when this substance becomes solid:
ice crystals
copper sulphate crystals
3 [uncountable and countable]HEG rock that is clear, or a piece of this
4 [countable] American EnglishTMC the clear cover on a clock or watch
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