Also found in: Thesaurus, Encyclopedia, Wikipedia.
Related to oil shale: Oil shale extraction
A black or dark brown shale containing hydrocarbons that yield petroleum by distillation.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) a fine-grained shale containing oil, which can be extracted by heating
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a black or dark-brown shale or siltstone rich in bitumens, from which shale oil is obtained.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.