yellowcake /ˈjɛləʊkeɪk 
/ ▸ noun 1 [mass noun] impure uranium oxide obtained during processing of uranium ore. 2 (yellow cake) US English a vanilla-flavoured sponge cake having a pale yellow colour from the egg yolks and butter in the recipe: spread icing over one layer of a yellow cake.
– ORIGIN 1940s: so named because the oxide is obtained as a yellow precipitate.
EnglishOxford Dictionary of English
