choroid

noun

cho·​roid ˈkȯr-ˌȯid How to pronounce choroid (audio)
variants or less commonly chorioid
ˈkȯr-ē-ˌȯid How to pronounce choroid (audio)
: 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
kə-ˈrȯi-dᵊl How to pronounce choroid (audio)

Examples of choroid in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
It is primarily produced by a network of cells called the choroid plexus, which is located in the brain’s ventricles or cavities. — Danielle Wilhour, Discover Magazine, 15 Aug. 2024 It is primarily produced by a network of cells called the choroid plexus, which is located in the brain’s ventricles, or cavities. — Danielle Wilhour, The Conversation, 14 Aug. 2024

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

Rhymes for choroid

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Browse Nearby Words

chorography
choroid
chorologic
See all Nearby Words

Cite this Entry

“Choroid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/choroid. Accessed 31 Mar. 2025.

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Kids Definition

choroid

noun
cho·​roid ˈkōr-ˌȯid How to pronounce choroid (audio)
ˈkȯr-
variants also chorioid
-ē-ˌȯid How to pronounce choroid (audio)
: the middle layer of the eye of vertebrates that contains pigment and is located between the sclera and the retina
choroid adjective

Medical Definition

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

called also choroid coat

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

More from Merriam-Webster on choroid

Britannica.com: Encyclopedia article about choroid

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