Offal.
Offal. The inedible parts of a butchered animal that are removed in dressing, consisting largely of the viscera and the trimmings, which may include, but are not limited to, brains, thymus, pancreas, liver, heart, kidney.
Source
9 CFR § 95.1
Scoping language
Whenever in the regulations in this part the following words, names, or terms are used they shall be construed, respectively, to mean: