coke
/kəʊk/
noun
Meaning
Solid residue from roasting coal in a coke oven; used principally as a fuel and in the production of steel and formerly as a domestic fuel.
"The plant should produce approximately 550,000 tons of screened blast furnace coke per year."
verb
Meaning
To produce coke from coal.
To turn into coke.
To add deleterious carbon deposits as a byproduct of combustion.