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definition of the word crystal

by the Wiktionnary

From Old English cristal 'clear ice/mineral', from Old French cristal, from Latin crystallum 'crystal, ice', from Ancient Greek κργσταλλοσ (krystallos) 'ice', from κργοσ (kryos) 'frost'; from the Proto-Indo-European base kru(s)-, meaning hard, hard outer surface.

Wikipedia has an article on:
Crystal

Wikipedia

Singular
crystal

Plural
countable and uncountable; crystals

crystal (countable and uncountable; plural crystals)

  1. (countable) A solid (mineral quartz or otherwise) composed of an array of atoms possessing long-range order and arranged in a pattern which is periodic in three dimensions.
  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.


Definition from Wiktionary
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