Definitions for oil cake
Random House Webster's College Dictionary
a cake or mass of linseed, cottonseed, soybean, or the like, from which the oil has been removed, used as food for livestock.
mass of e.g. linseed or cottonseed or soybean from which the oil has been pressed; used as food for livestock
The solid residue remaining after any oilseed has been pressed to remove the vegetable oil; it is used, with other ingredients, as animal food