carbonium

noun
car·bo·ni·um | \ kär-ˈbō-nē-əm \

Definition of carbonium 

: an organic ion carrying a positive charge on a carbon atom — compare carbanion

First Known Use of carbonium

1902, in the meaning defined above

History and Etymology for carbonium

carb- + -onium

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The first known use of carbonium was in 1902

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