The American Heritage® Dictionary of the English Language, 4th Edition
n. Either of two isomers of a gaseous hydrocarbon, C4H10, produced synthetically from petroleum and used as a household fuel, refrigerant, and aerosol propellant and in the manufacture of synthetic rubber.
n. A hydrocarbon (either of the two isomers of C4H10 n-butane, and 2-methyl-propane) found in gaseous petroleum fractions.
n. The n-butane isomer only.
the GNU version of the Collaborative International Dictionary of English
n. An inflammable gaseous saturated hydrocarbon, C4H10, of the marsh gas, or paraffin, series.
The Century Dictionary and Cyclopedia
n. In chem., the fourth member of the paraffin series of hydrocarbons, C4H10.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. occurs in natural gas; used in the manufacture of rubber and fuels
Word Usage
"They are very close to eachother with regard to the total amount of energy output from combustion, but because butane is heavier than propane, it boils at a higher (much higher) temperature, and that is the main drawback."