Usually means: Fossilized plant matter in coal.
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We found 7 dictionaries that define the word coal ball:

General (6 matching dictionaries)
  1. coal ball: Merriam-Webster
  2. coal-ball: Wordnik
  3. coal ball: Wiktionary
  4. coal ball: Infoplease Dictionary
  5. coal ball: Dictionary.com
  6. Coal ball: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. coal ball: Encyclopedia

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Definitions from Wiktionary (coal ball)

▸ noun:  A nodule of plant material permeated with minerals found mostly in bituminous and anthracite coal seams

Similar:
coalball, brown coal, coal, pitch coal, black coal, mineral coal, stone coal, soft coal, lignite, channel coal, more...

Opposite:
diamond, gemstone, crystal

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▸ Invented words related to coal ball

Similar:
coalball, brown coal, coal, pitch coal, black coal, mineral coal, stone coal, soft coal, lignite, channel coal, more...

Opposite:
diamond, gemstone, crystal



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