crystal

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.

Primary Meanings of crystal

1.
n
a solid formed by the solidification of a chemical and having a highly regular atomic structure
2.
n
a crystalline element used as a component in various electronic devices
3.
n
colorless glass made of almost pure silica
4.
n
glassware made of quartz
5.
n
a protective cover that protects the face of a watch
Full Definitions of crystal
1

n a solid formed by the solidification of a chemical and having a highly regular atomic structure

Types:
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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
twins
(mineralogy) two interwoven crystals that are mirror images on each other
ice, water ice
water frozen in the solid state
cabochon
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)
hailstone
small pellet of ice that falls during a hailstorm
icicle
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:
solid
matter that is solid at room temperature and pressure

n a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces

Synonyms:
crystallisation, crystallization
Types:
crystallite
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
2

n a crystalline element used as a component in various electronic devices

Types:
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
3

n colorless glass made of almost pure silica

Synonyms:
lechatelierite, quartz, quartz glass, vitreous silica
Type of:
natural glass
magma of any composition that cooled very rapidly
4

n glassware made of quartz

Type of:
glassware, glasswork
an article of tableware made of glass
5

n a protective cover that protects the face of a watch

Synonyms:
watch crystal, watch glass
Type of:
protection, protective cover, protective covering
a covering that is intend to protect from damage or injury