Definition of choroid in English:

choroid

Syllabification: cho·roid
Pronunciation: /ˈkôroid
 
/
(also chorioid /ˈkôrēˌoid/)

adjective

Resembling the chorion, particularly in containing many blood vessels.
More example sentences
  • As can be seen in the left hemisphere, the choroid plexus protrudes into the central part of the lateral ventricle, and the route of entry of the plexus is via the choroid fissure, between the fornix and the lamina affixa.
  • Medaka P is strongly expressed in the eyeball of embryos and adults, where melanin is produced in the choroid membrane and retinal pigment epithelium.
  • Thus the choroid plexuses of the lateral ventricles are in fact only lateral expansions of the tela choroidea of the 3rd ventricle, and they extend into the lateral ventricles by way of the choroid fissures.

noun

(also choroid coat) Back to top  
The pigmented vascular layer of the eyeball between the retina and the sclera.
More example sentences
  • Underneath the retina is the choroid - a thin layer of blood vessels that supplies oxygen and nutrients to the retina.
  • These changes occur in the optic disc or the place from where the optic nerve exits the eye, the retina or the light sensitive layer and the layer behind the retina called the choroid.
  • Choroidal melanoma is a tumor of the eye that forms from pigmented cells of the choroid, a layer of vascular tissue in the back of the eye.

Origin

mid 17th century: from Greek khoroeidēs (adjective), alteration of khorioeidēs, from khorion (see chorion).

Derivatives

choroidal

Pronunciation: /kəˈroidl/
adjective
More example sentences
  • The final frame is a photograph from indocyanine green angiography, showing the detailed architecture of the choroidal vasculature
  • Fundal examination showed a large choroidal rupture of the left macula.
  • However, the neovascular, exudative form results in serous or hemorrhagic detachment of retinal pigment epithelium and choroidal neovascularization.

Definition of choroid in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal