'Oil cake' definitions:

Definition of 'oil cake'

noun

Mass of e.g. linseed or cottonseed or soybean from which the oil has been pressed; used as food for livestock

From: GCIDE

Cake \Cake\ (k[=a]k), n. [OE. cake, kaak; akin to Dan. kage, Sw. & Icel. kaka, D. koek, G.kuchen, OHG. chuocho.] [1913 Webster]
1. A small mass of dough baked; especially, a thin loaf from unleavened dough; as, an oatmeal cake; johnnycake. [1913 Webster]
2. A sweetened composition of flour and other ingredients, leavened or unleavened, baked in a loaf or mass of any size or shape. [1913 Webster]
3. A thin wafer-shaped mass of fried batter; a griddlecake or pancake; as buckwheat cakes. [1913 Webster]
4. A mass of matter concreted, congealed, or molded into a solid mass of any form, esp. into a form rather flat than high; as, a cake of soap; an ague cake. [1913 Webster]
Cakes of rusting ice come rolling down the flood. --Dryden. [1913 Webster]
Cake urchin (Zool), any species of flat sea urchins belonging to the Clypeastroidea.
Oil cake the refuse of flax seed, cotton seed, or other vegetable substance from which oil has been expressed, compacted into a solid mass, and used as food for cattle, for manure, or for other purposes.
To have one's cake dough, to fail or be disappointed in what one has undertaken or expected. --Shak. [1913 Webster]