propanePronunciation: /ˈprəʊpeɪn/Translate propane | into Italian Definition of propane noun [mass noun] Chemistry a flammable hydrocarbon gas of the alkane series, present in natural gas and used as bottled fuel. Chemical formula: C3H8 Origin: mid 19th century: from propionic acid + -ane2propane in other Oxford dictionaries Definition of propane in the US English dictionary