choroid

noun
cho·​roid | \ ˈkȯr-ˌȯid How to pronounce choroid (audio) \
variants: or less commonly chorioid \ ˈkȯr-​ē-​ˌȯid How to pronounce choroid (audio) \

Definition of choroid

: 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

Other Words from choroid

choroid or choroidal \ kə-​ˈrȯi-​dᵊl How to pronounce choroid (audio) \ adjective

Examples of choroid in a Sentence

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

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'choroid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of choroid

1683, in the meaning defined above

History and Etymology for choroid

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

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Time Traveler for choroid

Time Traveler

The first known use of choroid was in 1683

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Dictionary Entries Near choroid

chorography

choroid

chorologic

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Statistics for choroid

Cite this Entry

“Choroid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/choroid. Accessed 13 Aug. 2022.

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More Definitions for choroid

choroid

noun
cho·​roid | \ ˈkō(ə)r-ˌȯid, ˈkȯ(ə)r- How to pronounce choroid (audio) \
variants: also chorioid \ ˈkōr-​ē-​ˌȯid, ˈkȯr-​ How to pronounce choroid (audio) \

Medical Definition of choroid

: a vascular membrane containing large branched pigment cells that lies between the retina and the sclera of the eye

called also choroid coat

Other Words from choroid

choroid or choroidal \ kə-​ˈrȯid-​ᵊl How to pronounce choroid (audio) \ adjective

More from Merriam-Webster on choroid

Britannica.com: Encyclopedia article about choroid

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