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Definition of: decidua
(di·sij′·ə) noun Physiol.
The thickened mucous membrane of the uterus cast off and expelled either during menstruation (decidua menstrualis) or at parturition (decidua graviditatis). [<NL (membrana) decidua (membrane) that is cast off <deciduus. See DECIDUOUS.]
—de·cid′u·al adjective
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