Resembling, containing, or producing coke (a type of fuel made from coal).
From 'coke' (coal fuel, from 17th-century cokers or coke makers) plus '-y' suffix meaning 'having the quality of.' The word emerged when coke production became widespread in industry.
Coal miners used to describe coal dust as 'coky' when it left dark, greasy marks—the same substance that made coke such a valuable industrial fuel in the Industrial Revolution!
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