Wiktionary
devil's food cake
n. A particularly rich form of chocolate cake.
WordNet
devil's food cake
n. very dark chocolate cake [syn: devil's food]
Wikipedia
Devil's food cake
Devil's food cake is a moist, airy, rich chocolate layer cake. It is considered a counterpart to the white or yellow angel food cake. Because of differing recipes and changing ingredient availability over the course of the twentieth century, it is difficult to precisely qualify what distinguishes devil's food from the more standard chocolate cake, though it traditionally has more chocolate than a regular chocolate cake, making it darker. The cake is usually paired with a rich chocolate frosting.