~ 1
■ noun a solid fuel made by heating coal in the absence of air so that the volatile components are driven off.
↘carbon residue left after the incomplete combustion or distillation of petrol or other fuels.
■ verb [usu. as noun coking ] convert (coal) into ~.
Origin
ME (in the sense 'charcoal'): of unknown origin.
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~ 2
■ noun informal term for cocaine .