Definition of coal:
(n) :
a black rock formed from
prehistoric plant
remains, composed largely of
carbon and burned as a fuel; a piece of coal used for burning. Note that in British English the first of the following examples would usually be used, whereas in American English the latter would
"put some coals on the fire."
(v) :
to take in coal; as, the
steamer coaled at Southampton; to be converted to
charcoal
"1957: As a result, particles of wood and twigs insufficiently coaled are frequently found at the bottom of such pits. — H.R. Schubert, History of the British Iron and Steel Industry, p. 18."