/ˈtʃɪmni/
[noun] A vertical pipe or hollow structure that carries smoke and hot gases from a fire or furnace up through a building and out into the open air. It can also refer to the part that sticks up above a roof.
The word 'chimney' comes from a Greek word meaning 'to burn with heat' — the same root that gave us 'camera'... almost.
The story of 'chimney' begins in ancient Greece, with the word 'kaminos' (κάμινος), meaning a furnace, oven, or any kind of enclosed structure used for burning. This was a practical, workaday word for the ancient Greeks, referring to kilns and hearths where fire did its work. From this root came the related Greek adjective 'kaminaios', meaning something associated with or coming from a furnace.
The Romans absorbed this idea into Latin, transforming 'kaminos' into 'caminus', which carried largely the same meaning — a forge, a furnace, an open fireplace. Latin was the great transmitting language of Europe, and it passed this word onward in a slightly altered form: 'caminata', which came to mean a room heated by a fireplace, or simply a fireplace itself. This was a significant shift — the word was no longer just about the burning structure, but about the room or space defined by its warmth.
From 'caminata', Old French developed the word 'cheminée', which narrowed the meaning further still, coming to refer specifically to the fireplace and the structure above it that channelled smoke upward and out of the building. It is worth pausing here to notice how beautifully language tracks technology and daily life: as buildings grew taller and fireplaces became more sophisticated, the word grew with them, shifting from furnace to heated room to fireplace to the chimney stack itself.
English borrowed 'cheminée' directly from Old French during the 14th century, at a time when Norman French was still deeply influencing the English language. The word entered Middle English as 'chimenee' or 'chymney', and over the following two centuries it settled into the spelling and pronunciation we recognise today. Interestingly, before chimneys became common in ordinary English homes — which did not happen widely until the 15th and 16th centuries — most people simply had a hole in the roof to let smoke escape. The arrival of the word and the arrival of the technology were almost simultaneous.
The meaning of 'chimney' has expanded quite naturally over the centuries. By the 19th century, during the Industrial Revolution, it was applied not just to domestic fireplaces but to the great smoking stacks of factories and steam engines, which became defining symbols of the era. Climbers also borrowed the word to describe a narrow vertical crack in a rock face wide enough for a person to climb up inside — a wonderfully visual metaphor that captures exactly the shape and function of the original structure. So the ancient Greek furnace, once used to fire clay or smelt metal, has given English a word that now describes everything from a cosy cottage hearth to a jagged mountain crevice.