[1] : The Collaborative International Dictionary of English v.0.48

octane \oc"tane\ o^k"t=an, n. see octa- chem.
   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.
   1913 webster +pjc
see also:
octa- c8h18 

[2] : WordNet (r) 2.0

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

[3] : Moby Thesaurus II by Grady Ward, 1.0

41 moby thesaurus words for "octane":
   alcohol, benzine, briquette, burnable, butane, carbon, charcoal,
   coal, coke, combustible, dope, ethane, ethanol, fireball, firing,
   flammable, flammable material, fuel, fuel additive, fuel dope, gas,
   gas carbon, gasoline, heptane, hexane, inflammable,
   inflammable material, isooctane, jet fuel, kerosene, methane,
   methanol, natural gas, oil, paraffin, peat, pentane, propane,
   propellant, rocket fuel, turf

Octane >> O Words
Octane, definition of term: Octane
octane_pag1.html

Octane Rating >> O Words
Octane Rating, definition of term: Octane Rating
octane+rating_pag1.html

Octane Number >> O Words
Octane Number, definition of term: Octane Number
octane+number_pag1.html