Octane
Pronunciation : Oc"tane
Part of Speech : n.
Etymology : [See Octa-] . (Chem.)
Definition : Defn: Any one of a group of metametric hydrocarcons (C8H18) of the methane series. The most important is a colorless, volatile, inflammable liquid, found in petroleum, and a constituent of benzene or ligroin.
Source : Webster's Unabridged Dictionary, 1913