DEFINITIONS

-onium

Chemistry.

a suffix used in the names of complex cations: oxonium.

Words nearby -onium

-oma, -ome, -on, -one, -onic, -onium, -ont, -onym, -oon, -opia, -opsia

Origin of -onium

extracted from ammonium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine definitions for -onium

-onium

suff.

Containing a positively charged radical:carbonium.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.