moon
UK[muːn]US[muːn]
n
the natural satellite of the earth, visible at night by reflected light from the sun
n
a natural satellite of any planet
Etymology
The word 'moon' originates from the Old English 'mōna', which is derived from the Proto-Germanic 'mēnô'. This, in turn, can be traced back to the Proto-Indo-European root 'mē-', meaning 'to measure', reflecting how ancient civilizations used the cycles of the moon to measure time. The semantic connection evolved from the concept of a time-measurer to the celestial body itself, a meaning that has remained remarkably stable across millennia in the Germanic languages.
Analysis
The word 'moon' is a simplex word of Germanic origin. It functions as a single, indivisible root morpheme.
Examples
The full moon was bright enough to cast shadows on the ground.
Jupiter has at least 79 known moons orbiting it.
They planned the expedition to coincide with the new moon.