octane (n.)youdaoicibaDictYouDict[octane 词源字典]
hydrocarbon of the methane series, 1872, coined from octo- (see octa-) + -ane; so called because it has eight carbon atoms. A fuel's octane rating, in reference to its anti-knocking quality, is attested from 1932.[octane etymology, octane origin, 英语词源]