menstruate
Concise Oxford English Dictionary © 2008 Oxford University Press:
menstruate /ˈmɛnstrʊeɪt/
▶verb (of a non-pregnant woman) discharge blood from the lining of the uterus at intervals of about one lunar month.
– derivatives
menstruation noun.
menstruation noun.
– origin C17 (earlier (ME) as menstruous): from late L. menstruat-, menstruare ‘menstruate’, from menstrua ‘menses’.
'menstruate' also found in these Oxford entries:

