Anatomy
decidua Audio
de·cid·u·a [ dih-sij-oo-uh ]
Subclass of:
Endometrium; Placenta
Etymology:
Latin deciduus = falling off
A deciduous tree is one which loses its leaves once a year.
Definitions related to decidua:
  • Endometrium of the pregnant uterus; shed at parturition, except for the deepest layer.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • The epithelial tissue of the endometrium.
    NCI
    U.S. National Cancer Institute, 2021
  • The hormone-responsive glandular layer of ENDOMETRIUM that sloughs off at each menstrual flow (decidua menstrualis) or at the termination of pregnancy. During pregnancy, the thickest part of the decidua forms the maternal portion of the PLACENTA, thus named decidua placentalis. The thin portion of the decidua covering the rest of the embryo is the decidua capsularis.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.