Cat's-eye n. (Min.) A variety of quartz or chalcedony, exhibiting opalescent reflections from within, like the eye of a cat. The name is given to other gems affording like effects, esp. the chrysoberyl.
... of the preceding day he had gone to the office to say good-by to the firm. He could not help being touched by the friendliness of both men's manner. Honaton gave him a silver traveling-flask, plain except for an offensive cat's-eye set in the top. Benson, more humane and ... — The Happiest Time of Their Lives • Alice Duer Miller
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