柯林斯詞典cation /?k?ta??n/ 1. N a positively charged ion; an ion that is attracted to the cathode during electrolysis 陽離子→compare anion 返回 cation劍橋詞典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 陽離子，正離子（帶有正電荷的離子，電解反應(yīng)中向電池陰極移動(dòng)） 返回 cation