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a suffix used in the names of complex cations: oxonium.
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Origin of -onium
Extracted from ammonium
Words nearby -onium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for -onium
This is a situation which agrees with no other city in all Egypt, except that which was the Onium of the later Jews.
Medical definitions for -onium
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.