/ˈkæmərə/
[noun] A device used to take photographs or record videos by capturing light through a lens onto a film or digital sensor. The word originally referred to a dark room or chamber used by artists to trace images.
Every camera you've ever used is named after a dark room — the Latin phrase for 'vaulted chamber' became the artist's secret tool.
The story of 'camera' begins in ancient Latin, where 'camera' meant a vaulted room or arched chamber. This Latin word was itself borrowed from the Greek 'kamara', which referred to anything with a curved or vaulted roof — an arched ceiling, a covered cart, or a small enclosed space. The root idea was always one of enclosure: a space that is shut off from the outside world. Greek kamara → Latin camera, meaning a vaulted room or chamber.
The crucial leap in the word's history came with the invention — or rather, the development — of the camera obscura, a Latin phrase meaning 'dark chamber'. Artists and scientists in the 16th and 17th centuries discovered that if you made a tiny hole in one wall of a completely dark room, an image of the outside world would be projected upside-down onto the opposite wall. Painters used this trick to trace accurate landscapes and portraits. The device shrank over time from a whole room to a portable box, but the name 'camera obscura' — dark chamber — stayed with it.
By the 18th century, 'camera obscura' had become a common instrument, and educated Europeans used the full Latin phrase to describe it. When the English language adopted the term, it came directly from this Latin phrase, which had remained essentially unchanged as it passed through Italian and French scientific writing before reaching English texts. The phrase arrived in English around the early 1700s, used by scientists, artists, and curious gentlemen who owned the portable box-shaped version as a drawing aid.
The real transformation of the word came with the invention of photography in the early 19th century. When Louis Daguerre and William Henry Fox Talbot found ways to fix the projected image permanently onto a chemical surface in the 1830s and 1840s, the device that had always been called a 'camera obscura' suddenly became the most important tool of the modern age. People quickly dropped the second word, 'obscura', and simply called the device a 'camera'. By the mid-19th century, the shortened form was standard in English, completely detached from its original meaning of a dark room.
Over the following century and a half, 'camera' expanded its meaning with technology. First it described photographic cameras using film, then motion picture cameras for cinema, then television cameras, then digital cameras, and today the tiny cameras built into smartphones. The word has also given English several important relatives: 'chamber' came into English from Old French 'chambre', which came from Latin 'camera' — so 'chamber' and 'camera' are, in a deep sense, the same word that simply traveled through different languages. Similarly, the French word 'chambre' → Old French 'chambre' → Middle English 'chambre' → modern English 'chamber'. Even the word 'comrade' has a distant connection, since it came from Spanish 'camarada', meaning a group of people sharing a room — again from Latin 'camera'.