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onetime
ongoing
ONI
onigiri
onion
onion dome
onionskin
Onitsha
-onium
onium ion
onkus
onlay
online
online debit card
onliner
onload
onlooker
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-onium
-onium


suffix 
Definition:
 
a complex positively charged ion cation
diazonium
[<ammonium]
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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