moon
noun
(the moon or the Moon)The earth’s moon orbits the earth in a period of 29.5 days, going through a series of phases from new moon to full moon and back again during that time. Its average distance from the earth is some 239,000 miles (384,000 km) and it is 2,160 miles (3,476 km) in diameter. The bright and dark features that outline the face of “the man in the moon” are highland and lowland regions, the high regions being heavily pockmarked by craters due to the impact of meteorites. The moon has no atmosphere, and the same side is always presented to the earth
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Origin:
Old English mōna, of Germanic origin; related to Dutch maan and German Mond, also to month, from an Indo-European root shared by Latin mensis and Greek mēn 'month', and also Latin metiri 'to measure' (the moon being used to measure time)