Dictionary![]() ![]() pro•panePronunciation: (prō'pān), [key] —n. Chem. a colorless, flammable gas, C3H8, of the alkane series, occurring in petroleum and natural gas: used chiefly as a fuel and in organic synthesis. Also called dimethylmethane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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