Offal

Offal is the entrails and internal organs of a butchered animal. The word does not refer to a particular list of organs, but includes most internal organs other than muscles or bones. People in some cultures shy away from offal as food, whilst others may make it everyday food or even delicacies that command a high price. Offal not used directly for human or animal food is often processed in a rendering plant, producing material that is used for animal feed, fertilizer, or fuel.

See in full =>
http://en.wikipedia.org/wiki/Offal