decidua

American  

[dih-sij-oo-uh] / dɪˈsɪdʒ u ə /

noun

Embryology.

deciduas, plural deciduae plural

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

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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

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Other Word Forms

Derived Forms

• decidual
  adjective

Inflected Forms

noun

• deciduas
  plural
• deciduae
  plural

Etymology

Origin of decidua

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

This seems to be the most reasonable view of menstruation; i.e., as an abortion of a decidua.

From Studies in the Psychology of Sex, Volume 1 The Evolution of Modesty; The Phenomena of Sexual Periodicity; Auto-Erotism by Ellis, Havelock

So the decidua reflex is to pass away with the birth, and the decidua vera is to change back again into its normal condition.

From What a Young Husband Ought to Know by Stall, Sylvanus