Anatomy
choroid Audio
cho·roid [ kawr-oid, kohr- ]
Subclass of:
Uvea
Etymology:
Greek chorion = skin + eidos = resemblance
Definitions related to choroid:
  • A blood vessel-containing membrane of the eye that lies between the retina and the sclera.
    NCI
    U.S. National Cancer Institute, 2021
  • A thin layer of blood vessels and connective tissue between the white of the eye (sclera) and the retina.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • A thin layer of tissue that is part of the middle layer of the wall of the eye, between the sclera (white outer layer of the eye) and the retina (the inner layer of nerve tissue at the back of the eye). The choriod is filled with blood vessels that bring oxygen and nutrients to the eye.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • The thin, highly vascular membrane covering most of the posterior of the eye between the RETINA and SCLERA.
    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.