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n. the modified mucous membrane that lines the wall of the uterus during pregnancy and is shed with the afterbirth at parturition (see endometrium). There are three regions: the decidua capsularis, a thin layer that covers the embryo; the decidua basalis, where the embryo is attached; and the decidua parietalis, which is not in contact with the embryo. —decidualadj.

Subjects: Medicine and Health.

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