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• copper, atomic number 29, cu
• Ｃｕ, あかがね, cu, 銅, 赤金, Cu
• a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor
• 延性順応性のある赤褐色の防腐反磁性金属元素