adjective, coalier, coaliest.
of, resembling, or containing coal.

1555–65; coal + -y1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coal (kəʊl)
1.  a.  anthracite bituminous coal lignite See also peat a combustible compact black or dark-brown carbonaceous rock formed from compaction of layers of partially decomposed vegetation: a fuel and a source of coke, coal gas, and coal tar
 b.  (as modifier): coal cellar; coal merchant; coal mine; coal dust
2.  one or more lumps of coal
3.  short for charcoal
4.  coals to Newcastle something supplied where it is already plentiful
5.  haul someone over the coals to reprimand someone
6.  to take in, provide with, or turn into coal
[Old English col; related to Old Norse kol, Old High German kolo, Old Irish gūal]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The roof shale may contain streaks and wisps of coaly material which tends to weaken the deposit.
Moreover, several cases of selenium poisoning in this area have been attributed to the use of coaly shale.
There has been only modest thermal maturation of the coaly surface horizon.
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