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.
menstruation men·stru·a·tion (měn'str&oomacr;-ā'shən)
n.
The process or an instance of discharging the menses.
menstruation (měn'str -ā'shən) Pronunciation Key
The monthly flow of blood from the uterus beginning at puberty in girls and other female primates. Also called menses. See also menstrual cycle. |