Collins COBUILD Advanced Learner's English Dictionary - menstruate

(menstruates, menstruating, menstruated) When a woman menstruates, a flow of blood comes from her womb. Women menstruate once a month unless they are pregnant or have reached the menopause. (FORMAL) Lean hard-training women athletes may menstruate less frequently or not at all. VERB: V • menstruation Menstruation may cease when a woman is anywhere between forty-five and fifty years of age. N-UNCOUNT