yellowcake

or yel·low cake

[yel-oh-keyk]
noun
  1. a processed oxide of uranium, U3O8, extracted and concentrated from uranium ore: used as the raw material for commercial nuclear materials, especially fuel elements in nuclear reactors.

Origin of yellowcake

First recorded in 1945–50; yellow + cake
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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