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1A bright lemon-yellow colour characteristic of some uranium compounds; frequently attributive.
2A yellow uranium-containing compound or pigment; specifically sodium diuranate, Na₂ U₂ O₇ ·6H₂ O, formed as a precipitate by adding sodium hydroxide to a solution of uranyl sulphate and formerly used in making yellow glass.
Mid 19th century; earliest use found in The Chemical Gazette.