noun, plural deciduas, deciduae [dih-sij-oo-ee] . Embryology.
the endometrium of a pregnant uterus that in many of the higher mammals is cast off at parturition.

1775–85; < Neo-Latin, noun use of feminine of Latin dēciduus falling; see deciduous

decidual, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decidua (dɪˈsɪdjʊə)
n , pl -ciduas, -ciduae
the specialized mucous membrane that lines the uterus of some mammals during pregnancy: is shed, with the placenta, at parturition
[C18: from New Latin, from Latin dēciduus falling down; see deciduous]

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American Heritage
Medical Dictionary

decidua de·cid·u·a (dĭ-sĭj'ōō-ə)
n. pl. de·cid·u·as or de·cid·u·ae (-ōō-ē')
A mucous membrane lining the uterus, modified during pregnancy and shed at parturition or during menstruation. Also called deciduous membrane.

de·cid'u·al adj.
The American Heritage® Stedman's Medical Dictionary
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