from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The dark-brown vascular coat of the eye between the sclera and the retina. Also called choroid coat, choroid membrane.
  • adj. Resembling the chorion; membranous.
  • adj. Of or relating to the choroid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The vascular layer of the eye lying between the retina and the sclera.

from the GNU version of the Collaborative International Dictionary of English

  • adj. resembling the chorion.

from The Century Dictionary and Cyclopedia

  • Membranous, as a chorion; like or likened to the chorion, as an investing part or tunic: in anatomy, applied to several delicate, highly vascular membranes which invest certain parts, and to associated structures.
  • n. A delicate, highly vascular membrane forming one of the coats or tunics of the eyeball, lining the sclerotic, and lying between it and the retina, with which it is in contact by its inner surface.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye


from The American Heritage® Dictionary of the English Language, 4th Edition

From Greek khoroeidēs, like an afterbirth, alteration of khorioeidēs : khorion, afterbirth; see chorion + -oeidēs, -oid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek χοριον + ειδος ("resembling skin").


  • In vertebrates, underneath the photoreceptors is a layer of pigment and pigment cells called the choroid the squid, cuttlefish and octopus have similar arrangements - more on this later, this layer of pigment absorbs stray light that is not caught by the photoreceptors, which might reflect back and fuzz up the image.

    Denton vs Squid; the eye as suboptimal design. - The Panda's Thumb

  • —The choroid is a thin, highly vascular membrane, of a dark brown or chocolate color, investing the posterior five-sixths of the globe; it is pierced behind by the optic nerve, and in this situation is firmly adherent to the sclera.

    X. The Organs of the Senses and the Common Integument. 1c. 1. The Tunics of the Eye

  • (PhysOrg. com) -- A team of scientists from the University of Toronto, the Hospital for Sick Children (SickKids) and The Children's Hospital of Los Angeles have identified a genetic mutation that plays a major role in the outcome of a paediatric brain cancer called choroid plexus carcinoma. - latest science and technology news stories

  • Researchers have discovered that an organ in the brain called the choroid plexus apparently plays a ...


  • The uvea, or uveal tract, includes the iris and the dark, pigmented area known as the choroid, which contains the jellylike vitreous humor, as well as blood vessels that ferry blood and nutrients into and out of the eye.

  • We went for the Level 2 ultrasound (and found out it was a boy and got a MOVIE - very nice) and only one marker was seen (choroid plexus cysts).

    Dark, Update | Her Bad Mother

  • A parishioner of mine has a son who suffers with Choroideremia, a rare inherited disorder that causes progressive loss of vision due to degeneration of the choroid and retina.

    Archive 2009-09-01

  • To add to the confusion, Mondino dei Luzzi (1306) described the choroid plexus in the lateral ventricles as a worm which can open and close the passage between the anterior and middle ventricles, with the result that, in the late Middle Ages, the term ˜worm™ could refer to no less than three different parts of the brain: the vermis of the cerebellum, the pineal body and the choroid plexus

    Descartes and the Pineal Gland

  • Second, Andreas Vesalius (1543, book 7) rejected all ventricular localization theories and all theories according to which the choroid plexus, pineal gland or vermis of the cerebellum can regulate the flow of spirits in the ventricles of the brain.

    Descartes and the Pineal Gland

  • Again, no markers and the choroid plexus cysts were resolving oh, and another movie!

    Dark, Update


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