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-
brownor black shale, from which petroleum- like hydrocarbonscan be producedby 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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