Refiner/rɪˈfaɪnər/ Definition 1 of 2Pro Tip 1/3Industry Specific Used mainly in industrial contexts, not in everyday conversation. She works for a copper refiner in Arizona. Pro Tip 2/3Purity or Quality Focuses on enhancing the quality or purity of materials. The refiner ensures that impurities are removed from the silver. Pro Tip 3/3Production Improvement Implies increased efficiency or value of the end product. The refiner's role is crucial in improving the gasoline quality.