| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| the offspring of a zebra and a donkey. |
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. |
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.