allene

  1. Noun.  (organic chemistry) Any of a class of hydrocarbons having two double bonds from one carbon atom to two others - R2C=C=CR2; especially the parent compound CH2=C=CH2 (propadiene).
  2. Noun.  (organic chemistry) Any derivative of such hydrocarbons.

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This entry was last updated on RefTopia from its source on 3/20/2012.