yellowcake /ˈyelōˌkāk, ˈjɛloʊˌkeɪk
/ ▸ noun 1 impure uranium oxide obtained during processing of uranium ore. 2 (yellow cake) US a vanilla-flavored cake having a pale yellow color 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.