The difference between Crystal and Glass
When used as nouns, crystal means a solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions, whereas glass means an amorphous solid, often transparent substance made by melting sand with a mixture of soda, potash and lime.
Crystal is also adjective with the meaning: very clear.
Glass is also verb with the meaning: to fit with glass.
check bellow for the other definitions of Crystal and Glass
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Crystal as a noun (countable):
A solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions.
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Crystal as a noun (countable):
A piece of glimmering, shining mineral resembling ice or glass.
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Crystal as a noun (uncountable):
A fine type of glassware, or the material used to make it.
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Crystal as a noun (uncountable, slang):
Crystal meth: methamphetamine hydrochloride.
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Crystal as a noun:
The glass over the dial of a watch case.
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Crystal as an adjective:
Very clear.
Examples:
"Do I make myself clear?" / "Crystal."
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Glass as a noun (uncountable):
An amorphous solid, often transparent substance made by melting sand with a mixture of soda, potash and lime.
Examples:
"The tabletop is made of glass."
"A popular myth is that window glass is actually an extremely viscous liquid."
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Glass as a noun (countable):
A vessel from which one drinks, especially one made of glass, plastic, or similar translucent or semi-translucent material.
Examples:
"Fill my glass with milk, please."
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Glass as a noun (metonymically):
The quantity of liquid contained in such a vessel.
Examples:
"There is half a glass of milk in each pound of chocolate we produce."
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Glass as a noun (uncountable):
Glassware.
Examples:
"We collected art glass."
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Glass as a noun:
A mirror.
Examples:
"She adjusted her lipstick in the glass."
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Glass as a noun:
A magnifying glass or telescope.
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Glass as a noun (sport):
A barrier made of solid, transparent material. The backboard. The clear, protective screen surrounding a hockey rink.
Examples:
"He caught the rebound off the glass."
"He fired the outlet pass off the glass."
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Glass as a noun:
A barometer.
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Glass as a noun (attributive, in names of species):
Transparent or translucent.
Examples:
"'glass frog;  glass shrimp;  glass worm"
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Glass as a noun (obsolete):
An hourglass.
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Glass as a verb (transitive):
To fit with glass; to glaze.
Examples:
"rfquotek Boyle"
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Glass as a verb (transitive):
To enclose in glass.
Examples:
"rfquotek Shakespeare"
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Glass as a verb (transitive):
. To fit, cover, fill, or build, with fibreglass-reinforced resin composite (fiberglass).
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Glass as a verb (transitive, UK, colloquial):
To strike (someone), particularly in the face, with a drinking glass with the intent of causing injury.
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Glass as a verb (science fiction):
To bombard an area with such intensity (nuclear bomb, fusion bomb, etc) as to melt the landscape into glass.
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Glass as a verb:
To view through an optical instrument such as binoculars.
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Glass as a verb:
To smooth or polish (leather, etc.), by rubbing it with a glass burnisher.
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Glass as a verb (archaic, reflexive):
To reflect; to mirror.
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Glass as a verb:
To become glassy.