Definitions
1.nounA black rock formed from prehistoric plant remains, composed largely of carbon and burned as a fuel."Put some coal on the fire."
2.nounA piece of coal used for burning (this use is less common in American English)"Put some coals on the fire."
3.nounA type of coal, such as bituminous, anthracite, or lignite, and grades and varieties thereof.
4.nounA glowing or charred piece of coal, wood, or other solid fuel."Just as the camp-fire died down to just coals, with no flames to burn the marshmallows, someone dumped a whole load of wood on, so I gave up and went to bed."
5.nounCharcoal.
6.verbTo take on a supply of coal (usually of steam ships).
7.verbTo supply with coal."to coal a steamer"
8.verbTo be converted to charcoal.
9.verbTo burn to charcoal; to char.
10.verbTo mark or delineate with charcoal.