ENDOMETRIUM
\ˌɛndə͡ʊmˈɛtɹi͡əm], \ˌɛndəʊmˈɛtɹiəm], \ˌɛ_n_d_əʊ_m_ˈɛ_t_ɹ_iə_m]\
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(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
By Princeton University
By Henderson, I. F.; Henderson, W. D.