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onium compound

/ˈəʊnɪəm/
noun
1.
(chem) any salt in which the positive ion (onium ion) is formed by the attachment of a proton to a neutral compound, as in ammonium, oxonium, and sulphonium compounds
Word Origin
C20: from (amm)onium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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