What does coke mean?
Coke is a hard, porous, carbon-rich solid fuel made by heating coal in ovens that exclude air — a process called coking — which drives off volatile matter and leaves nearly pure carbon. It burns hotter and cleaner than raw coal, making it indispensable to the iron and steel industries: in a blast furnace, coke both generates intense heat and chemically reduces iron ore to metallic iron. A related material, petroleum coke, derives from oil refining rather than coal. Beyond this industrial sense, coke has two well-known informal uses: as a shortened name for the soft drink Coca-Cola (sometimes applied generically to any cola) and as street slang for the stimulant cocaine. The intended meaning is usually obvious from context — an engineer discussing furnace charge means the fuel, while a diner asking for a coke wants a drink. The industrial noun dates back centuries and remains central to heavy manufacturing worldwide.
A solid fuel consisting mainly of carbon, made by heating coal out of contact with air; used especially for smelting iron.
"Steel production depends on a steady supply of high-quality coke."
To convert (coal) into coke by heating it in the absence of air.
"The plant cokes its own coal on site to cut costs."
Chiefly technical or industrial usage.
Usually uncountable when referring to the bulk fuel; the plural appears mostly when counting servings of the soft drink.
"She bought three cokes for the road trip."
Without coke, the modern steel industry would grind to a halt — nearly every skyscraper and car owes its existence to this baked-coal fuel.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of coke
The word coke first appears in English writing in the late medieval period, referring to the charred coal fuel used by early metalworkers. Its ultimate etymology is uncertain, though it may derive from an older dialectal word meaning 'core' or 'charring', reflecting how the substance forms at the heart of burned coal. The verb 'to coke', meaning to convert coal into coke, developed naturally from the noun. No widely accepted cognates in other languages exist, given the word's murky origins.
Related word forms
How coke is actually used
In metallurgical contexts the word is neutral and technical. As a soft-drink shorthand it is informal and often regionally marked; in some parts of the American South 'coke' is used generically for any soda. As slang for cocaine it belongs to casual or illicit registers. Context almost always disambiguates.
Easily confused with coke
Coal is the raw fossil fuel mined from the ground, while coke is a manufactured fuel produced by heating coal without air.
Cock means a rooster or a tap/valve, differing entirely in meaning despite similar spelling.