octane

Any of various isomeric alkanes with the formula C₈H₁₈, found in petroleum and used as a fuel and solvent.

An octane number.

An oily hydrocarbon, C₈H₁₈, of the paraffin series. It occurs in petroleum, and is one of the chief constituents of ligroin. It boils at 124° C. The name is sometimes given to diisobutyl (C₈H₁₈).

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.

Any of the eighteen isomeric aliphatic hydrocarbons (C8H18) found in petroleum, especially an iso-octane 2,2,4 trimethyl-pentane; they are used as fuels and solvents.

any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent