choroid

choroid
The middle vascular tunic of the eye lying between the pigment epithelium and the sclera. SYN: choroidea [TA]. [G. choroeides, a false reading for chorioeides, like a membrane]

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cho·roid 'kō(ə)r-.ȯid, 'kȯ(ə)r- also cho·ri·oid 'kōr-ē-.ȯid, 'kȯr- n a vascular membrane containing large branched pigment cells that lies between the retina and the sclera of the eye called also choroid coat
choroid or cho·roi·dal kə-'rȯid-əl adj

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n.
the layer of the eyeball between the retina and the sclera (see also Bruch's membrane). It contains blood vessels and a pigment that absorbs excess light and so prevents blurring of vision. See eye.
• choroidal adj.

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cho·roid (korґoid) [chori- + -oid] 1. the thin, pigmented, vascular coat of the eyeball extending from the ora serrata to the optic nerve; it furnishes blood supply to the retina and conducts arteries and nerves to the anterior structures. Called also chorioid, choroidea [TA], and chorioidea. 2. resembling the chorion.

Choroid shown in relation to other coats and related structures of the eye.


Medical dictionary. 2011.

Look at other dictionaries:

  • Choroid — Schematic cross section of the human eye; choroid is shown in purple …   Wikipedia

  • Choroid — Cho roid, a. [gr. ?; ? chorion + e i^dos form.] (Anat.) resembling the chorion; as, the choroid plexuses of the ventricles of the brain, and the choroid coat of the eyeball. n. The choroid coat of the eye. See {Eye}. [1913 Webster] {Choroid… …   The Collaborative International Dictionary of English

  • choroid — 1680s, from Latinized form of Gk. khoroeides, a corruption of khorioeides, from khorion (see CHORION (Cf. chorion)) + eidos resemblance (see OID (Cf. oid)) …   Etymology dictionary

  • choroid — [kôr′oid΄] adj. [Gr choroeidēs, contr. < chorioeidēs < chorion, CHORION + eidēs, OID] designating or of the chorion or certain other vascular membranes n. the dark, vascular membrane that forms the middle coat of the eye, between the sclera …   English World dictionary

  • choroid — UK [ˈkɔːrɔɪd] / US [ˈkɔrɔɪd] noun [countable] Word forms choroid : singular choroid plural choroids medical the part of your eye that is between the retina and the white of your eye. The coloured iris at the front of your eye is part of the… …   English dictionary

  • choroid — also chorioid noun Etymology: New Latin choroides resembling the chorion, from Greek chorioeidēs, from chorion chorion Date: 1683 a vascular membrane containing large branched pigmented cells that lies between the retina and the sclera of the… …   New Collegiate Dictionary

  • choroid — Middle layer of the vertebrate eye, between retina and sclera. Well vascularized 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 …   Dictionary of molecular biology

  • choroid — /kawr oyd, kohr /, Anat. adj. 1. like the chorion; membranous. n. 2. See choroid coat. Also, choroidal, chorioid, chorioidal. [1625 35; < Gk choroeidés false reading for chorioeidés CHORIOID] * * * …   Universalium

  • choroid — noun /ˈkəʊrɔɪd,ˈkoʊrɔɪd/ The vascular layer of the eye lying between the retina and the sclera. See Also: chorioid, choroidea, choroid coat …   Wiktionary

  • choroid(o)- — a combining form denoting relationship to the choroid …   Medical dictionary

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