Various solid substances that glitter because their surfaces are made up of planes that catch the light are called crystals. If you leave your ice cream in the freezer too long, you may find a coating of ice crystals on top.

Some people think that certain natural crystals — quartz, for instance — have mystical properties and if you wear them or hold them, they cure whatever’s wrong with you. Crystal is also the word for transparent glass made of silica, and it's also a name for fine glassware — the kind that reverberates with a nice ping when you flick your fingernail against it. Another kind of crystal is the glass cover that protects the face of your watch.

Definitions of crystal
  1. noun
    a solid formed by the solidification of a chemical and having a highly regular atomic structure
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    flake, snowflake
    a crystal of snow
    diamond dust, frost mist, frost snow, ice crystal, ice needle, poudrin, snow mist
    small crystals of ice
    gem, gemstone, stone
    a crystalline rock that can be cut and polished for jewelry
    (mineralogy) two interwoven crystals that are mirror images on each other
    ice, water ice
    water frozen in the solid state
    a highly polished gem that is cut convexly but without facets
    black ice
    a thin coating of ice (as from freezing mist) on a road or sidewalk; nearly invisible but very hazardous
    frost, hoar, hoarfrost, rime
    ice crystals forming a white deposit (especially on objects outside)
    small pellet of ice that falls during a hailstorm
    ice resembling a pendent spear, formed by the freezing of dripping water
    opaque gem
    a gemstone that is opaque
    transparent gem
    a gemstone having the property of transmitting light without serious diffusion
    type of:
    matter that is solid at room temperature and pressure
  2. noun
    a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
    synonyms: crystallisation, crystallization
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    any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock
    type of:
    rock, stone
    a lump or mass of hard consolidated mineral matter
  3. noun
    a crystalline element used as a component in various electronic devices
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    piezoelectric crystal
    a crystal that can be used as a transducer
    type of:
    component, constituent, element
    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
  4. noun
    colorless glass made of almost pure silica
    synonyms: lechatelierite, quartz, quartz glass, vitreous silica
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    type of:
    natural glass
    magma of any composition that cooled very rapidly
  5. noun
    glassware made of quartz
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    type of:
    glassware, glasswork
    an article of tableware made of glass
  6. noun
    a protective cover that protects the face of a watch
    synonyms: watch crystal, watch glass
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    type of:
    protection, protective cover, protective covering
    a covering that is intend to protect from damage or injury
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