From The Collaborative International Dictionary of English v.0.44 [gcide]:
Propane \Pro"pane\, noun [Propyl + methane.] (Chem.) A heavy gaseous hydrocarbon, {C3H8}, of the paraffin series, occurring naturally dissolved in crude petroleum, and also made artificially; -- called also {propyl hydride}.
From WordNet (r) 2.0 [wn]:
noun
1: colorless gas found in natural gas and petroleum; used as a fuel
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
41 Moby Thesaurus words for "propane": 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, pentane, propellant, rocket fuel, turf
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