coal rank

noun

The measure or degree of the progressive coalification (organic metamorphism) of a coal, often expressed in terms of vitrinite reflectance.

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Meanings

nouncoal rank (countable and uncountable, plural coal ranks)

plural coal ranks

  1. countableuncountablegeographyThe measure or degree of the progressive coalification (organic metamorphism) of a coal, often expressed in terms of vitrinite reflectance.
Cite this entry
APA

coal rank. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/coal%20rank

MLA

“coal rank.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/coal%20rank. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “coal rank,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/coal%20rank.

Source: coal rank on Wiktionary, CC BY-SA 4.0.