kerogen

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ker·o·gen

 (kĕr′ə-jən)
n.
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.

kerogen

(ˈkɛrədʒən)
n
(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

ker•o•gen

(ˈkɛr ə dʒən, -ˌdʒɛn)

n.
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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