decidua

American  

[dih-sij-oo-uh] / dɪˈsɪdʒ u ə /

noun

Embryology.

plural

deciduas, deciduae

1. the endometrium of a pregnant uterus that in many of the higher mammals is cast off at parturition.

---

decidua British  

/ dɪˈsɪdjʊə /

noun

1. the specialized mucous membrane that lines the uterus of some mammals during pregnancy: is shed, with the placenta, at parturition

---

Other Word Forms

• decidual adjective

Etymology

Origin of decidua

1775–85; < New Latin, noun use of feminine of Latin dēciduus falling; deciduous

Example Sentences

The research showed that the decidua, the layer of the uterine lining that forms during pregnancy, and blood vessels, are sending different signals to the placenta when a pregnant person has placenta accreta.

From Science Daily • Jan. 30, 2024

The maternal portion of the placenta develops from the deepest layer of the endometrium, the decidua basalis.

From Textbooks • Jun. 19, 2013

The placental decidua serotina is that part of the preceding which is completely transformed by the ingrowth of the chorion-villi, and is used for constructing the placenta.

From The Evolution of Man — Volume 1 by Haeckel, Ernst Heinrich Philipp August

The tubal placenta possesses foetal structures, the true decidua forming in the uterus.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" by Various

All the higher Placentals that have this decidua are classed together as the "Deciduates."

From The Evolution of Man — Volume 2 by Haeckel, Ernst Heinrich Philipp August