(kär-bē′nē-əm)n. An organic cation, such as H3C+, having one less electron than a corresponding free radical and having a positive charge localized on the carbon atom.[carb(o)- + -en(e) + -ium.]
carbenium ion
carbenium ion
[kär′bē·nē·əm ‚ī·ən] (organic chemistry) A cation in which the charged atom is carbon; for example, R2C+, where R is an organic group.