名詞 cation:

1. a positively charged ion

cat.i.on

n.（名詞）
An ion or group of ions having a positive charge and characteristically moving toward the negative electrode in electrolysis.
陽離子：帶有正電荷的一個或一群離子，特點為在電解中向陰極運動

來源：
Greek kation [something going down] [from neuter of] katiôn [present participle of] katienai
希臘語 kation [向下的某物] [] 源自katiôn的中性詞 [] katienai的現(xiàn)在分詞
kat-, kata- [cata-]
kat-, kata- [前綴，表.之下，向下.]
ienai [to go] * see ei-
ienai [去] *參見 ei-

【引伸】
cat.ion.ic