Definition of octane in English:

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Pronunciation: /ˈäktān/


A colorless flammable hydrocarbon of the alkane series, obtained in petroleum refining.
  • Chemical formula: C8H18; many isomers, especially the straight-chain isomer (n-octane) . See also isooctane.
Example sentences
  • Carbon in its most reduced form is found in alkanes, which are typically fuels like methane, propane, and octane.
  • Instead, new engines have been designed to run on lower octane gasoline, which is made of hydrocarbons that are resistant to knock.
  • Four different solvent media were considered: octane, tetrahydrofuran, acetonitrile, and water.


Late 19th century: from octo- 'eight' (denoting eight carbon atoms) + -ane2.

For editors and proofreaders

Syllabification: oc·tane

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