We found 8 dictionaries that define the word coal mines:

General (6 matching dictionaries)

1. coal mines: Collins English Dictionary
2. coal mines: Vocabulary.com
3. coal-mines: Wordnik
4. coal mines: Cambridge Advanced Learner's Dictionary
5. coal mines: Wiktionary
6. Coal mines: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

7. Coal mines: Encyclopedia

Slang (1 matching dictionary)

8. Coal Mines: Urban Dictionary

(Note: See coal_mine as well.)

Definitions from Wiktionary (coal mine) ▸ noun:  A mine from which coal ore or coal minerals are mined. ▸ Also see coal_mine ▸ Words similar to coal mines ▸ Usage examples for coal mines ▸ Idioms related to coal mines ▸ Wikipedia articles (New!) ▸ Words that often appear near coal mines ▸ Rhymes of coal mines ▸ Invented words related to coal mines