The term RIDS OF IMPURITIES can be summarized by the crossword solution REFINES, which is a seven-letter word. Refining is a process used to purify materials, such as metals, by removing impurities. This process is often used in the production of various products, such as fuel, pharmaceuticals, and food. Refining can also be used to improve the quality of a material, making it more suitable for its intended use.