·vt To convert into coke.
II. Coke ·noun Mineral coal charred, or depriver of its bitumen, sulphur, or other volatile matter by roasting in a kiln or oven, or by distillation, as in gas works. It is lagerly used where / smokeless fire is required.
pit or sea-coal, charred for the smelting of metals. S. ...
A glossary of provincial and local words used in England by Francis Grose