1970–75, Americanism; syn(thetic) + fuel Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Cultural Dictionary
synfuels [(sin-fyooh-uhlz)]

Short for synthetic fuels. Synfuels are substances made through the extraction of petroleum or coal from minerals found in the western United States.

Note: The cost of synfuels is presently too high to make them commercially attractive.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
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