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cat's-eye

(Encyclopedia)cat's-eye, gemstone that displays a thin band of reflected light on its surface when cut as a cabochon. Its name is derived from its supposed resemblance to the eye of a cat. The optical effect, known...

radiology

(Encyclopedia)radiology, branch of medicine specializing in the use of X rays, gamma rays, radioactive isotopes, and other forms of radiation in the diagnosis and treatment of disease. X ray machines and fluoroscop...

Kit-Cat Club

(Encyclopedia)Kit-Cat Club, London political and literary club, active c.1700–1720. The membership of some four dozen included leading Whig politicians and London's best young writers. Among them were Charles Sey...

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