carbonium

car.bo.ni.um

n.（名词）
An organic cation, such as H3C, having one less electron than a corresponding free radical and with positive charge localized on the carbon atom.
正碳，阳碳：一种有机阳离子，如H3C，碳原子上具有一个比相对应的原子团弱的电子，并有一正电子