vinylidene

noun
vi·​nyl·​i·​dene | \vī-ˈni-lə-ˌdēn \

Definition of vinylidene 

: a divalent radical CH2=C derived from ethylene by removal of two hydrogen atoms from one carbon atom

First Known Use of vinylidene

1898, in the meaning defined above

History and Etymology for vinylidene

International Scientific Vocabulary vinyl + -ide + -ene

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The first known use of vinylidene was in 1898

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