crystal
Word family adjectivecrystallinecrystallizablecrystallogeneticcrystallographicnouncrystallinitycrystallitecrystallitiscrystallizationcrystallogenesiscrystallographercrystallographycrystalloidcrystallomancycrystal methcrystalverbcrystallizeadverbcrystallographically
Glass, Geology, Chronology, Chemistry
crys·tal /ˈkrɪstl/ ●●○ noun 
1 [uncountableU]TIG very high quality clear glass 水晶玻璃 a set of six crystal glasses
六件套水晶玻璃杯
2 [countableC]HEG a small regular-shaped piece of a substance, formed naturally when this substance becomes solid 结晶（体）
ice crystals
冰晶
copper sulphate crystals
硫酸铜结晶
3. [countableC, uncountableU]HEG rock that is clear, or a piece of this （一块）水晶
4. [countableC] American EnglishAmETMC the clear cover on a clock or watch 〔钟面或表面的〕透明盖片
Examples from the Corpus
crystal• The table was set with the best china and crystal.• She ran herself a deep bath with bath crystals and perfume poured into the water.• Granulites are like their textural equivalents, granular igneous rocks, in being mosaics of interlocking crystals of roughly equal size.• One of the simplest is an ionic crystal like sodium chloride, the first mineral analyzed after the discovery of x-ray diffraction.• It is even possible to dissolve certain types of crystal if the foods used are special diets, carefully chosen by vets.• Argenta silvered crystal bowl; perfume bottle.• The door wasn't locked, and the simularity crystal was still in the desk reader.• copper sulfate crystals• It is a challenge for the future to demonstrate that crystal engineering is providing a new way of thinking chemistry.• The crystal acts as an analyser which ascertains whether or not the photon has polarisation perpendicular to the optical axis of the crystal.
(1000-1100) Old French cristal, from Latin crystallum, from Greek krystallos “ice, crystal”