From Longman Dictionary of Contemporary Englishmensesmen‧ses /ˈmensiːz/ noun [plural] medicalHBHM the blood that flows out of a woman’s body each month
Examples from the Corpus
menses• Headaches before menses which are often scanty.• Relief often comes with a discharge such as the menses or a nasal discharge etc.Origin menses (1500-1600) Latin “months” 