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onium ion
on·i·um i·on [ ṓnee əm  ən ] (plural on·i·um i·ons)


noun 
Definition:
 
positively charged ion: a positively charged ion cation that is analogous to the ammonium ion. NH4+
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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