endometrium
ˌɛndə(ʊ)ˈmiːtrɪəm
noun
the mucous membrane lining the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo.
noun
the mucous membrane lining the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo.