intransitive verb
Definition: A black or brownish-black solid fossil fuel that is used for heating and generating electricity.
Example: The power plant burns coal to produce electricity.
noun
Definition: A black or dark brown material that is used as fuel, made from ancient plants that have turned into rock-like substances over millions of years.
Example: The workers loaded the coal onto the train for transportation to the power plant.
transitive verb
Definition: A black or brownish-black solid that is made from ancient plant material and is used as a fuel for heating and generating electricity.
Example: The workers began to coal the furnace to prepare for the winter.