camerayoudaoicibaDictYouDict[camera 词源字典]
camera: [18] Latin camera originally meant ‘vaulted room’ (a sense preserved in the Radcliffe Camera, an 18th-century building housing part of Oxford University library, which has a vaulted roof). It came from Greek kamárā ‘vault, arch’, which is ultimately related to English chimney. In due course the meaning ‘vaulted room’ became weakened to simply ‘room’, which reached English, via Old French chambre, as chamber, and is preserved in the legal Latin phrase in camera ‘privately, in judge’s chambers’.

In the 17th century, an optical instrument was invented consisting of a small closed box with a lens fixed in one side which produced an image of external objects on the inside of the box. The same effect could be got in a small darkened room, and so the device was called a camera obscura ‘dark chamber’. When the new science of photography developed in the 19th century, using the basic principle of the camera obscura, camera was applied to the picture-forming box.
=> chamber, chimney[camera etymology, camera origin, 英语词源]
camera (n.)youdaoicibaDictYouDict
1708, "vaulted building," from Latin camera "vaulted room" (source of Italian camera, Spanish camara, French chambre), from Greek kamara "vaulted chamber."

The word also was used early 18c. as a short form of Modern Latin camera obscura "dark chamber" (a black box with a lens that could project images of external objects), contrasted with camera lucida (Latin for "light chamber"), which uses prisms to produce on paper beneath the instrument an image, which can be traced. It became the word for "picture-taking device" when modern photography began, c. 1840 (extended to television filming devices 1928). Camera-shy is attested from 1890. Old Church Slavonic komora, Lithuanian kamara, Old Irish camra all are borrowings from Latin.