plural of coal rank

(geology) The measure or degree of the progressive coalification (organic metamorphism) of a coal, often expressed in terms of vitrinite reflectance.

Bituminous coal which is suitable for making into coke, for example for use in steel manufacture.

Having been enveloped in a cloud of soot from the exhaust of a coal roller, who rolled coal, who engaged in coal-rolling.

(automotive) One that rolls coal; one that produces copious amounts of partially burnt fuel as black smoke in automotive exhaust on purpose.

The activity of the verb to roll coal.

Engaging in the action of the verb to roll coal.

(informal) lignite

Alternative form of cannel coal

Alternative form of seacoal