noun, plural de·cid·u·as, de·cid·u·ae [dih-sij-oo-ee] /dɪˈsɪdʒ uˌi/. Embryology.
the endometrium of a pregnant uterus that in many of the higher mammals is cast off at parturition.
Origin of decidua
1775–85;Related formsde·cid·u·al, adjective
< New Latin,
noun use of feminine of Latin dēciduus
falling; see deciduous
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for decidua
Historical Examples of decidua
Folds of this nature, which are specially developed in Man and Apes, are known as a decidua reflexa.
The decidua reflexa of the Rat is reduced to extreme tenuity, or even vanishes before the close of gestation.
The decidua reflexa and serotina together envelop the chorion, the processes of which fit into crypts in them.
The chorion frondosum, together with the decidua serotina, gives rise to the placenta.
This ovum, though probably not more than thirteen days old, was completely enclosed by a decidua reflexa.
British Dictionary definitions for decidua
noun plural -ciduas or -ciduae (-ˈsɪdjʊˌiː)
Derived Formsdecidual or deciduate, adjective
the specialized mucous membrane that lines the uterus of some mammals during pregnancy: is shed, with the placenta, at parturition
Word Origin for decidua
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
n. pl. de•cid•u•as
Related formsde•cid′u•al adj.
A mucous membrane lining the uterus, modified during pregnancy and shed at parturition or during menstruation.deciduous membrane
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.