zenith

The story

1. Medieval Latincenit
2. Middle Englishcenyth
3. English todayzenith

From Middle English cenyth, from Medieval Latin cenit, from Arabic سَمْت (samt, “direction, path”), from the fuller form سَمْت اَلرَّأْس (samt ar-raʔs, “direction of the head”). The -ni- for -m- is sometimes thought to be due to a misreading of the three strokes, which is plausible, though it could be a mere phonetic approximation.