sulfonyl

noun
sul·​fo·​nyl | \ˈsəl-fə-ˌnil \

Definition of sulfonyl 

: the divalent group SO2

First Known Use of sulfonyl

1920, in the meaning defined above

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The first known use of sulfonyl was in 1920

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sulfonyl

noun
sul·​fo·​nyl
variants: or chiefly British sulphonyl \ ˈsəl-​fə-​ˌnil \

Medical Definition of sulfonyl 

: the bivalent group SO2

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