Normal, regular menstrual flow and cycle without pain, irregularity, or excessive bleeding.
From Greek 'eu' (good/normal) + 'meno' (month) + 'rhea' (flow), essentially a medical term for textbook-perfect menstruation used as a standard of health.
Eumenorrhea is the medical term for the ideal menstrual cycle—and defining this standard was actually crucial for women's health because it gave doctors a baseline to compare against when something seemed wrong.
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