Dictionary

onium

adjective oni·um \ˈō-nē-əm\

Definition of ONIUM

:  being or characterized by a usually complex cation
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Origin of ONIUM

-onium
First Known Use: 1905
Medical Dictionary

onium

adjective oni·um \ˈō-nē-əm\

Medical Definition of ONIUM

:  being or characterized by a usually complex cation <onium salts>

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