cation
noun [ C ] chemistry specialized uk/ˈkæt.aɪ.ən/ us/ˈkæt.aɪ.ən/
阳离子，正离子（带有正电荷的离子，电解反应中向电池阴极移动）
in chemistry, an ion (= type of atom) that has a positive electric charge and therefore moves towards the cathode (= negative part of electric cell) during electrolysis