coalification
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coal·i·fi·ca·tion
(kō′lə-fĭ-kā′shən)n.
Compression and hardening over long periods of time, the processes by which coal is formed from plant materials.
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.
coalification
(ˌkəʊlɪfɪˈkeɪʃən)n
the compression, over time, of plant matter into coal
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
coal•i•fi•ca•tion
(ˌkoʊ lə fɪˈkeɪ ʃən)n.
the conversion of plant material into coal by natural processes, as by diagenesis and, in some instances, metamorphism.
[1910–15]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.