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octane Line breaks: oc¦tane
Pronunciation: /ˈɒkteɪn/

Definition of octane in English:


[mass noun] Chemistry
A colourless flammable hydrocarbon of the alkane series, present in petroleum spirit.
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.

Definition of octane in:
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