- the periodic discharge of blood and mucosal tissue from the uterus, occurring approximately monthly from puberty to menopause in nonpregnant women and females of other primate species.
- the period of menstruating.
- the approximately monthly discharge of blood and cellular debris from the uterus by nonpregnant women from puberty to the menopauseAlso called: menses Nontechnical name: period
n.1680s, from Late Latin menstruare, from menstruus “monthly” (see menstrual) + -ation. Old English equivalent was monaðblot “month-blood.” Middle English had menstrue (n.), late 14c., from Old French menstrue, from Latin menstruum. n.
- The process or an instance of discharging the menses.
- The monthly flow of blood from the uterus beginning at puberty in girls and other female primates. Also called menses See also menstrual cycle.
The periodic discharge of the blood-enriched lining of the uterus through the vagina. Menstruation marks the end of one menstrual cycle and the beginning of another.