shale oil

noun
petroleum distilled from oil shale.

Origin:
1855–60

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
shale oil
 
n
an oil distilled from shales and used as fuel

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
As for shale oil, acid rain issues will have seemed mild by comparison.
And not to mention the new energy sources of oil sands and shale oil, which
  will be even more environmentally invasive.
Shale oil production is a water-intensive process: up to five barrels of water
  are consumed for every barrel of oil produced.
Shale oil produced for sale to independent refiners will initially be sold as
  boiler fuel.
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