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octane

From The Collaborative International Dictionary of English v.0.48:

octane \oc"tane\ ([o^]k"t[=a]n), 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]

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