Definitions for oil shale
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Random House Webster's College Dictionary
oil′ shale`(n.)
a black or dark-brown shale or siltstone rich in bitumens, from which shale oil is obtained.
Category: Geology
Origin of oil shale:
1870–75
Princeton's WordNet
oil shale(noun)
shale from which oil can be obtained by heating
Wiktionary
oil shale(Noun)
a dark-brown or black shale, from which petroleum-like hydrocarbons can be produced by distillation
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"oil shale." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/oil shale>.