bar-code

The word 'barcode' is a modern English compound, formed in the mid-20th century. Its first element, 'bar', traces back to the Vulgar Latin 'barra', meaning a barrier or rod, which evolved to signify a straight, linear mark. The second element, 'code', originates from the Latin 'codex', referring to a wooden tablet or a book, later developing the sense of a systematic collection of laws or symbols. The compound logically combines these images: a 'code' represented visually by a series of parallel 'bars'. This literal description of its physical form directly names the technology's function of encoding data in a machine-readable, linear pattern.

Structure: bar (sense) + code (sense) - bar: English, from Old French 'barre' (rod, gate). In this compound, it functions as a noun meaning a straight, narrow line or strip. - code: English, from Latin 'codex' (block of wood, book). In this compound, it functions as a noun meaning a system of symbols for conveying information.