GNU Collaborative International Dictionary of English

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1.       
   octane (ŏkˈtān), n. [See Octa-] (Chem.) Any one of a group of metametric hydrocarbons (C8H18) of the methane (paraffin) series.  The most important is a colorless, volatile, inflammable liquid, found in petroleum, and a constituent of gasoline or ligroin.
   
   [1913 Webster +PJC]