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Noun

crystal (countable and uncountable, plural crystals)

1. (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.

   Synonyms:

   grain

   Antonyms:

   glass

2. (countable) A piece of glimmering, shining mineral resembling ice or glass.
3. (uncountable) A fine type of glassware, or the material used to make it.
4. (slang, uncountable) Crystal meth; methamphetamine hydrochloride.
   • He tells me he's been shooting crystal, which I already pretty much know because he does not bother to keep his sleeves rolled down over the needle tracks.1968, Joan Didion, “Slouching Towards Bethlehem”, in Slouching Towards Bethlehem
5. (figuratively, obsolete, plural-normally) A person's eye.
   • Come, let's away. My loue, giue me thy Lippes: Looke to my Chattels, and my Moueables: [...] Goe, cleare they Chryſtalls. Yokefellowes in Armes, let vs to France1599 (date written), William Shakespeare, “The Life of Henry the Fift”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount...
6. The glass over the dial of a watch case.

See all 16 meanings of crystal