from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A rich, finely textured yellow cake containing eggs, flour, butter, and sugar.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A dense yellow cake, the traditional recipe for wich consists of equal quantities (nominally one pound) of butter, eggs, flour, and sugar.
From the original recipe, calling for a pound each of butter, sugar, and flour.(American Heritage® Dictionary of the English Language, Fourth Edition)
From pound ("unit of mass") + cake. (Wiktionary)