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[dih-sij-oo-uh] /dɪˈsɪdʒ u ə/
noun, plural deciduas, deciduae
[dih-sij-oo-ee] /dɪˈsɪdʒ uˌi/ (Show IPA).
the endometrium of a pregnant uterus that in many of the higher mammals is cast off at parturition.
Origin of decidua
1775-85; < New Latin, noun use of feminine of Latin dēciduus falling; see deciduous
Related forms
decidual, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for decidual


noun (pl) -ciduas, -ciduae (-ˈsɪdjʊˌiː)
the specialized mucous membrane that lines the uterus of some mammals during pregnancy: is shed, with the placenta, at parturition
Derived Forms
decidual, deciduate, adjective
Word Origin
C18: from New Latin, from Latin dēciduus falling down; see deciduous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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decidual in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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