(n.) Any one of the three metameric hydrocarbons, C5H12, of the methane or paraffin series. They are colorless, volatile liquids, two of which occur in petroleum. So called because of the five carbon atoms in the molecule.

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 octane oil paraffin peat propane propellant rocket fuel turf