Menstruation

[men-stroo-ey-shuh n, -strey-] /ˌmɛn struˈeɪ ʃən, -ˈstreɪ-/

noun
1.
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.
2.
the period of .
/ˌmɛnstrʊˈeɪʃən/
noun
1.
the approximately monthly discharge of blood and cellular debris from the uterus by nonpregnant women from puberty to the menopause Also 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.

menstruation men·stru·a·tion (měn’strōō-ā’shən)
n.
The process or an instance of discharging the menses.
menstruation
(měn’str-ā’shən)
The monthly flow of blood from the uterus beginning at puberty in girls and other female primates. Also called menses. See also menstrual cycle.
menstruation [(men-strooh-ay-shuhn)]

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.