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The word "menstruation" is etymologically related to "moon". The terms "menstruation" and "menses" are derived from the Latin mensis (month), which in turn relates to the Greek mene (moon) and to the roots of the English words month and moon—reflecting the fact that the moon also takes 27.32 days to revolve around the Earth. The synodical lunar month, the period between two new moons (or full moons), is 29.53 days long.
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