from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A hydrocarbon deposit, such as petroleum, coal, or natural gas, derived from living matter of a previous geologic time and used for fuel.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. any fuel derived from hydrocarbon deposits such as coal, petroleum, natural gas and, to some extent, peat; these fuels are irreplaceable, and their burning generates the greenhouse gas carbon dioxide
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content
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