enium ion

enium ion

[′en·ē·əm ‚ī·ən]
(organic chemistry)
A cationic portion of an ionic species in which the valence shell of a positively charged nonmetallic atom has two electrons less than normal, and the charged entity has one covalent bond less than the corresponding uncharged species; used as a suffix with the root name. Also known as ylium ion.