精せい銅どうせいどうMeanings1nounrefined copperTechnical term for copper that has been purified, typically to a high degree of purity, used in industrial and metallurgical contexts.精せい銅どうは電でん気き伝でん導どう性せいが高たかいため、電でん線せんに広ひろく使つかわれている。