|  coal 
  
 
 other fuels FUEL, ELECTRICITY, GAS, OIL
 - a hard, black substance, usually dug from under the ground, which is used as a fuel: coal (noun U)
 a bag of coal ◎ a lump of coal (= one piece of coal)
 a coal fire
 - a place where coal is dug from the ground: mine, coal mine
 - a large area which has a lot of coal under the ground: coalfield
 - a man who works in a mine: miner
 - to use coal in a fire: burn sth
 Does your boiler burn oil or coal?
 
 
 |  |