Tallowing is the process of rendering animal fat into a solid form. Some synonyms for tallowing include rendering, processing, melting, and purifying. Rendering refers to the process of extracting oils or fats and separating them from other tissues. Processing describes the steps taken to transform raw materials into a final product. Melting refers to the application of heat to change a solid substance into a liquid form. Purifying means to remove impurities and refine a substance for use. Although these terms differ slightly in their meanings, they all relate to the process of tallowing and are used interchangeably in many contexts.