noun, plural de·cid·u·as, de·cid·u·ae [dih-sij-oo-ee] /dɪˈsɪdʒ uˌi/. Embryology.
  1. 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 formsde·cid·u·al, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for decidual


noun plural -ciduas or -ciduae (-ˈsɪdjʊˌiː)
  1. the specialized mucous membrane that lines the uterus of some mammals during pregnancy: is shed, with the placenta, at parturition
Derived Formsdecidual or deciduate, adjective

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

decidual in Medicine


n. pl. de•cid•u•as
  1. A mucous membrane lining the uterus, modified during pregnancy and shed at parturition or during menstruation.deciduous membrane
Related formsde•cidu•al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.