Definition of crystal - WordReference.com Dictionary

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crystal:

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crystal
A	noun
	1	crystal, watch crystal, watch glass
			a protective cover that protects the face of a watch
		Category Tree: entity ╚object; physical object ╚artifact; artefact ╚covering ╚protective covering; protective cover; protection ╚crystal, watch crystal, watch glass
	2	crystal
			glassware made of quartz
		Category Tree: entity ╚object; physical object ╚artifact; artefact ╚article ╚ware ╚tableware ╚glassware; glasswork ╚crystal
	3	crystal
			a crystalline element used as a component in various electronic devices
		Category Tree: entity ╚object; physical object ╚part; portion ╚component; constituent; element ╚crystal ╚piezoelectric crystal
	4	crystal, crystallization
			a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
		Category Tree: entity ╚object; physical object ╚natural object ╚rock; stone ╚crystal, crystallization ╚crystallite
	5	quartz glass, quartz, vitreous silica, lechatelierite, crystal
			colorless glass made of almost pure silica
		Category Tree: entity ╚substance; matter ╚solid ╚glass ╚natural glass ╚quartz glass, quartz, vitreous silica, lechatelierite, crystal
	6	crystal
			a solid formed by the solidification of a chemical and having a highly regular atomic structure
		Category Tree: entity ╚substance; matter ╚solid ╚crystal ╚ice; water ice ╚twins ╚gem; gemstone; stone ╚ice crystal; snow mist; diamond dust; poudrin; ice needle; frost snow; frost mist ╚snowflake; flake

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Distinguising between glass and crystal
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