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endometrium (n.)

"lining membrane of the uterus," 1882, medical Latin, from endo- + Greek mētra "uterus," related to mētēr "mother" (see mother (n.1)). Related: Endometrial (1870).

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Definitions of endometrium from WordNet

endometrium (n.)
(pregnancy) the mucous membrane that lines the uterus; thickens under hormonal control and (if pregnancy does not occur) is shed in menstruation; if pregnancy occurs it is shed along with the placenta at parturition;
From wordnet.princeton.edu