Agricultural by-products
Agricultural by-products means those parts of arable crops that are not used for the primary purpose of producing food. Agricultural by-products include, but are not limited to, oat, corn and wheat straws, bagasse, peanut shells, rice and coconut husks, soybean hulls, palm kernel cake, cottonseed and sunflower seed cake, and pomace.
Source
40 CFR § 98.6
Scoping language
All terms used in this part shall have the same meaning given in the Clean Air Act and in this section.