odometer

The word 'odometer' is a modern scientific compound formed from two ancient Greek roots. The first part, from hodos (way, journey), refers to the path traveled. The second part, from metron (measure), indicates the instrument's function. Literally meaning "a measure of the journey," the term was adopted into English in the late 18th century to name the device that mechanically calculates the distance a vehicle has traversed. The evolution from the concrete Greek concepts of "road" and "measurement" to the specific modern instrument exemplifies how classical roots are repurposed to label technological innovations.

Structure: hodo (road, path) + meter (measure) - hodo: From Greek hodos, meaning "way, road, path, journey". In English spelling, the initial 'h' is dropped, and the 'o' is retained from the Greek stem. - meter: From Greek metron, meaning "a measure". A combining form used in English to denote an instrument for measuring.