Definition of decidua in English:


Syllabification: de·cid·u·a
Pronunciation: /diˈsijo͞oə


  • The thick layer of modified mucous membrane that lines the uterus during pregnancy and is shed with the afterbirth.
    More example sentences
    • One mechanism by which microorganisms might cause preterm labor is through ascension from the cervical/vaginal area and replication in the placenta, decidua and membranes.
    • There were large amounts of polarizable foreign body material contained within the membranes and maternal decidua, without associated inflammation or tissue reaction.
    • The tissue is sent to the laboratory where the fetal villi are dissected from the maternal decidua and either processed directly or cultured for chromosomal, DNA or biochemical analysis.



Pronunciation: /-jo͝oəl/
More example sentences
  • The pathophysiologic events that trigger preterm birth are largely unknown but may include decidual hemorrhage, uterine overdistension, and hormonal changes possibly mediated by fetal or maternal stress.
  • The thickened, hormonally charged decidual tissue is a fertile implantation site for the enlarging placenta and also acts as a barrier between the placental tissue and uterine muscle.
  • Separate fragments of secretory endometrium with decidual stromal reaction and inactive glands were also seen.


late 18th century: from modern Latin decidua (membrana), literally 'falling off (membrane)'.

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