from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A black or dark brown shale containing hydrocarbons that yield petroleum by distillation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun a dark-brown or black shale, from which petroleum-like hydrocarbons can be produced by distillation

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun shale from which oil can be obtained by heating


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