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vinylidene

vinylidene Chem.
  (vaɪˈnɪlɪdiːn, vaɪˈnaɪlɪdiːn)
  [f. vinyl + -idene.]
  The bivalent radical CH2 = C>.

1898 Jrnl. Chem. Soc. LXXIV. i. 188 Acetic anhydride converts it first into oxanilide, and subsequently into vinylidene oxanilide. 1940 [see Saran]. 1980 Chem. in Brit. XVI. 473/1 Vinylidene, indole or leuco crystal violet are used as the colour formers.., and carbon tetrabromide or iodoform as the activator.

Oxford English Dictionary

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