choroid

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choroid

 [kor´oid]
the middle, vascular coat of the eye, between the sclera and the retina. adj., adj choroid´al. It contains an abundant supply of blood vessels and a large amount of brown pigment that serves to reduce reflection or diffusion of light when it falls on the retina. Adequate nutrition of the eye is dependent upon blood vessels in the choroid.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

cho·roid

(kor'oyd), [TA]
Portion of the middle or vascular layer of the eyeball lying between the pigment epithelium and the sclera and posterior to the other parts of the vascular layer, the ciliary body, and iris.
Synonym(s): choroidea [TA]
[G. choroeidēs, a false reading for chorioeidēs, like a membrane]
Farlex Partner Medical Dictionary © Farlex 2012

choroid

(kôr′oid′) or

chorioid

(kôr′ē-oid′)
n.
The dark-brown vascular coat of the eye between the sclera and the retina. Also called choroid coat, choroid membrane.
adj.
1. Resembling the chorion; membranous.
2. Of or relating to the choroid.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

choroid

noun The highly vascularised and pigmented nutrient middle layer of the eye, located between retina and sclera (the tapetum is an iridescent layer in the choroid of some eyes); part of the uvea.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

cho·roid

(kōr'oyd) [TA]
The middle vascular tunic of the eye lying between the retina and the sclera.
Synonym(s): choroidea [TA] .
[G. choroeidēs, a false reading for chorioeidēs, like a fetal membrane]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

choroid

The densely pigmented layer of blood vessels lying just under the retina of the eye, contributing to its fuel and oxygen supply and optical efficiency.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

choroid

  1. a layer behind the retina of the vertebrate eye which contains blood vessels and pigment.
  2. resembling the CHORION.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Choroid

The part of the uveal tract behind the ciliary body. The choroid underlies and nourishes the retina and absorbs scattered light.
Mentioned in: Uveitis
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.