Definition of Choroid

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

Exact synonyms: Choroid Coat
Group relationships: Eye, Oculus, Optic
Generic synonyms: Membrane, Tissue Layer

Definition of Choroid

1. a. resembling the chorion; as, the choroid plexuses of the ventricles of the brain, and the choroid coat of the eyeball.

Definition of Choroid

1. Noun. (anatomy) The vascular layer of the eye lying between the retina and the sclera. ¹

¹ Source:

Definition of Choroid

1. a membrane of the eye [n -S]

Medical Definition of Choroid

1. Middle layer of the vertebrate eye, between retina and sclera. Well vascularised and also pigmented to throw light back onto the retina (the tapetum is an irridescent layer in the choroid of some eyes). Not to be confused with the choroid plexus, a highly vascularised region of the roof of the ventricles of the vertebrate brain that secretes cerebrospinal fluid. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Choroid Pictures

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Lexicographical Neighbors of Choroid

choroid (current term)
choroid branches
choroid coat
choroid diseases
choroid fissure
choroid glomus
choroid haemorrhage
choroid neoplasms
choroid plexus neoplasms
choroid plexus of fourth ventricle
choroid plexus of lateral ventricle
choroid plexus of third ventricle
choroid plexus papilloma
choroid skein

Literary usage of Choroid

Below you will find example usage of this term as found in modern and/or classical literature:

1. Anatomy: Descriptive and Surgical by Henry Gray (1897)
"At the junction between the choroid plexus of the body and that of the descending ... Structure of choroid Plexus.—The plexus consists of minute and highly ..."

2. Diseases of the eye: A Handbook of Ophthalmic Practice for Students and by George Edmund De Schweinitz (1916)
"Two striking congenital anomalies occur connection with the choroid : 1 _ Coloboma of the choroid is a large defect in the choroid, almost . ..."

3. A Practical treatise on the diseases of the eye by William Mackenzie, Thomas Wharton Jones (1855)
"In one, the posterior half was so affected ; in others, the anterior part ; in some, the whole choroid. He also quotes from Günz, an instance of ..."

4. Anatomy, Descriptive and Applied by Henry Gray (1913)
"The sclera is then carefully incised, in the equator of the globe, until the choroid is exposed. One blade of a pair of probe-pointed scissors is now ..."

5. Manual of the diseases of the eye: For Students and General Practitioners by Charles Henry May (1909)
"The choroid is a dark brown membrane placed between the sclera ami the retina. ... The choroid itself extends from the ora serrata to the aperture for the ..."

6. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1896)
"SKY (Prague) calls attention to the comparatively rare cases is which sarcoma of the choroid, instead of giving rise to a circumscribed tumor, extends with ..."

7. The Anatomy and Physiology of the Human Body by John Bell, Charles Bell (1829)
"OF THE choroid COAT. The choroid is the vascular tunic of the eye : it is so ... It was Ruysch who observed this division of the choroid coat into two ..."

8. Lessons in elementary physiology by Thomas Henry Huxley (1881)
"Unstriped muscular fibres, having the same attachment in front, spread backwards on to the outer surface of the choroid, constituting the ciliary muscle ..."

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