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oil shale

noun, Geology
1.
a black or dark-brown shale or siltstone rich in bitumens, from which shale oil is obtained by destructive distillation.
Origin
1870-1875
1870-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for oil shale
  • oil shale extraction is similarly difficult and energy-intensive.
British Dictionary definitions for oil shale

oil shale

noun
1.
a fine-grained shale containing oil, which can be extracted by heating
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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oil shale in Science
oil shale  
A fine-grained black or dark brown shale containing hydrocarbons in the form of kerogen. When heated, oil shale yields petroleum or natural gas.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Word Value for oil

3
4
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