altazimuth

The word 'altazimuth' is a modern scientific compound, primarily formed in English from telescoped elements of two older terms. Its first component, 'alt-', is clipped from 'altitude', which traces back to the Latin altus for 'high'. The second component, '-azimuth', is itself a loanword from Arabic astronomy (as-sumūt, 'the directions'), entering English via Medieval Latin. The final '-muth' reflects the Greek -metron (measure), a common suffix in scientific instruments. Thus, the term's literal construction—'high-direction-measurer'—perfectly describes its function of determining both the vertical angle (altitude) and horizontal compass bearing (azimuth) of stars and planets.

Structure: alt (high) + azi (direction) + muth (measurement) - alt: From Latin altus (high). Denotes height or altitude. - azi: From Arabic as-sumūt (the directions), via Medieval Latin azimuth. Denotes direction or bearing. - muth: A variant of the suffix -meter, from Greek -metron (measure). Denotes an instrument for measuring.