1 having changeable lustre; twinkling
2 (of a gem, esp. a cabochon) displaying a band of light reflected off inclusions of other minerals
3 a gemstone with a changeable lustre, such as a cat's eye
(C18: from French, from chatoyer to gleam like a cat's eyes, from chat cat1)
English Collins Dictionary - English Definition & Thesaurus
having a changeable luster or color with an undulating narrow band of white light
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