altimeter

The word 'altimeter' is a modern scientific compound formed in the late 19th century from two classical roots. The first element, 'alti-', derives from the Latin adjective altus, meaning "high" or "deep," which itself originates from the Proto-Indo-European root al-, "to grow, nourish," conceptually linking growth to increased height. The second element, '-meter', comes from the Greek metron, meaning "measure," traceable to the PIE root me-, "to measure." The logic of the word is perfectly transparent: it is literally a "height-measurer." This combination follows a standard pattern in technical English, where Latin and Greek stems are fused to create precise terminology for instruments, in this case, one that calculates elevation above a fixed level, such as sea level.

Structure: alti (high) + meter (measure) - alti: From Latin altus (high). A combining form meaning "height" or "altitude." - meter: From Greek metron (measure). A combining form meaning "measuring device."