Definition of uranium yellow in US English:

uranium yellow

noun

  • 1A bright lemon-yellow colour characteristic of some uranium compounds; frequently attributive.

  • 2A yellow uranium-containing compound or pigment; specifically sodium diuranate, Na₂U₂O₇·6H₂O, formed as a precipitate by adding sodium hydroxide to a solution of uranyl sulphate and formerly used in making yellow glass.

Origin

Mid 19th century; earliest use found in The Chemical Gazette.