Okla. Admin. Code § 35:37-3-24
The following words and terms, when used in this Part shall have the following meanings, unless the context clearly indicates otherwise:
"Blender" means any person who acquires inedible by-products of bodies or parts of bodies of dead animals or poultry or used cooking grease and oils for the purpose of blending them to obtain a desired percentage of protein, degree of quality, or color for use in animal feed, poultry feed, or fertilizers.
"Collection center" means any place where bodies or parts of bodies of dead animals or poultry or used cooking grease and oils are collected for loading into a permitted vehicle for delivery to the renderer.
"Permittee" means any person issued a vehicle permit.
"Renderer" means any person who, for purposes other than human consumption, collects, cooks, and processes bodies or parts of bodies of dead animals and poultry, or used cooking grease and oils for the purpose of salvaging hides, wool, skins, or feathers and or for the production of animal and poultry protein, blood meal, bone meal, grease, or tallow.
"Rendering materials" means bodies or parts of bodies of dead animals or poultry and used cooking grease and oils.
Okla. Admin. Code § 35:37-3-24