| Noun | 1. | crystal - a solid formed by the solidification of a chemical and having a highly regular atomic structuregem, gemstone, stone - a crystalline rock that can be cut and polished for jewelry; "he had the gem set in a ring for his wife"; "she had jewels made of all the rarest stones" twins - (mineralogy) two interwoven crystals that are mirror images on each other ice, water ice - water frozen in the solid state; "Americans like ice in their drinks" solid - a substance that is solid at room temperature and pressure | |
| 2. | crystal - a crystalline element used as a component in various electronic devicesconstituent, element, component - an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system" crystal counter - a counter tube in which an ionizing event increases conductivity crystal detector - a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier crystal microphone - a microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage crystal pickup - a cartridge in which an output voltage is produced by the vibration of a piezoelectric crystal | |
| 3. | crystal - a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane facescrystallite - any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock rock, stone - a lump or mass of hard consolidated mineral matter; "he threw a rock at me" | |
| 4. | crystal - colorless glass made of almost pure silicanatural glass - magma of any composition that cooled very rapidly | |
| 5. | crystal - glassware made of quartz | |
| 6. | crystal - a protective cover that protects the face of a watch | |