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pro·pane 'prō-.pān n a heavy flammable gaseous alkane C3H8 found in crude petroleum and natural gas and used esp. as fuel and in chemical synthesis
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pro·pane (proґpān) a hydrocarbon of the methane series, CH3CH2CH3, which is a constituent of natural gas and crude petroleum and occurs as a colorless flammable gas with a characteristic odor.Medical dictionary. 2011.