endometrium
/ˌɛndoʊˈmiːtriəm/
noun
- The mucous membrane lining the inside of the uterus, which thickens during the menstrual cycle and is shed during menstruation.
- During a menstrual period, the endometrium breaks down and is expelled from the body.
- Doctors may examine the endometrium with a biopsy to check for abnormal cells.
- The endometrium thickens each month to prepare for a possible pregnancy.