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choroid

noun

cho·​roid ˈkȯr-ˌȯid How to pronounce choroid (audio)
variants or less commonly chorioid
: a vascular membrane containing large branched pigmented cells that lies between the retina and the sclera of the vertebrate eye

called also choroid coat

see eye illustration
choroid adjective
or choroidal

Example Sentences

Recent Examples on the Web The team also discovered that one of the astronauts developed folds in the choroid, the layer of blood vessels and tissue between the retina and the sclera. Jennifer Leman, Popular Mechanics, 3 Mar. 2022 The condition, known technically as birdshot chorioretinopathy, causes severe, progressive inflammation of the retina and the choroid, the vascular layer of the eye. Caren Chesler, Popular Mechanics, 6 Mar. 2019 Nightstar, a gene therapy company based in the U.K., has been undergoing clinical trials to address choroideremia, a mutation in the CHM gene that leads to degeneration of the choroid (Misrok’s vision is affected by choroid damage). Caren Chesler, Popular Mechanics, 6 Mar. 2019 Behind the retina is a part of the eye called the choroid. sandiegouniontribune.com, 20 Sep. 2017

Word History

Etymology

New Latin choroides resembling the chorion, from Greek chorioeidēs, from chorion chorion

First Known Use

1683, in the meaning defined above

Time Traveler
The first known use of choroid was in 1683

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