Definition of "crystals" []

• Plural form of crystal. (noun)

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• "Or are they, as was so generally maintained in the fifteenth, sixteenth, and seventeenth centuries, mere figured stones, portions of mineral matter which have assumed the forms of leaves and shells and bones, just as those portions of mineral matter which we call crystals take on the form of regular geometrical solids?"
• "WHO's regional food safety expert Anthony Hazzard told Reuters Tuesday: "We believe at this stage that it's really the complex of melamine and cyanuric acid forming what you call crystals ... they can form in the small tubules [in the kidneys] and they get bigger and can block the tubules.""
• "The dots in the background are crystals from the glaze."