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coalification

[koh-luh-fi-key-shuh n]
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noun Geology.
  1. the conversion of plant material into coal by natural processes, as by diagenesis and, in some instances, metamorphism.

Origin of coalification

First recorded in 1910–15; coal + -i- + -fication
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018