decidua
noun
de·cid·ua
di-ˈsi-jə-wə
-jü-ə
plural deciduae
di-ˈsi-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
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Merriam-Webster unabridged
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