Definition of decidua
plural de·cid·u·aeplay \-jə-ˌwē, -jü-ˌē\
1 : the part of the endometrium that in higher placental mammals undergoes special modifications in preparation for and during pregnancy and is cast off at parturition
2 : the part of the endometrium cast off in the process of menstruation
Origin of decidua
New Latin, from Latin, feminine of deciduus
First Known Use: 1785
Medical Definition of decidua
plural de·cid·uae \-ˌwē\play
1: the part of the mucous membrane lining the uterus that in higher placental mammals undergoes special modifications in preparation for and during pregnancy and is cast off at parturition, being made up in the human of a part lining the uterus, a part enveloping the embryo, and a part participating with the chorion in the formation of the placenta—see decidua basalis, decidua capsularis, decidua parietalis
2: the mucous membrane of the uterus cast off in the ordinary process of menstruation
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Medical Dictionary: Definition of "decidua"
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