coking

/K OW1 K IH0 NG/
verb
  1. 1

    To produce coke from coal.

  2. 2

    To turn into coke.

  3. 3

    To add deleterious carbon deposits as a byproduct of combustion.

noun
  1. 1

    The manufacture of coke via the destructive distillation of coal

Source: https://en.wiktionary.org/wiki/coke, https://en.wiktionary.org/wiki/coking