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A fossilized material in shale and other sedimentary rock that yields oil upon heating.

[Greek kēros, wax + -gen.]
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.


(Minerals) the solid organic material found in some rocks, such as oil shales, that produces hydrocarbons similar to petroleum when heated
[C20: from Greek kēro(s) wax + -gen]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈkɛr ə dʒən, -ˌdʒɛn)

the bituminous matter in oil shale from which shale oil is obtained by heating and distillation.
[1905–10; < Greek kēró(s) wax + -gen]
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