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-onium

Chemistry
1.
a suffix used in the names of complex cations:
oxonium.
Origin
extracted from ammonium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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-onium in Medicine

-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.
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