cornea

noun

cor·​nea ˈkȯr-nē-ə How to pronounce cornea (audio)
: the transparent part of the coat of the eyeball that covers the iris and pupil and admits light to the interior see eye illustration
corneal adjective

Examples of cornea 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.
Unlike the innumerable photons from sunlight, perhaps a dozen per second trickle through my cornea from this distant messenger, having departed it years ago, colliding with my photoreceptors and ending their unlikely journey. Rowan Jacobsen, Harpers Magazine, 24 Oct. 2025 Because the surface of the cornea contains multiple tiny microabrasions from your contact rubbing against it, these can function as openings for the amoeba to infiltrate—and the longer you’re exposed to it, the further in it can burrow. Holly Burns, Time, 23 Oct. 2025 The actor's kidneys and corneas were also donated. Angela Andaloro, PEOPLE, 20 Oct. 2025 Yuhas said rubbing could trigger keratoconus, an eye condition that weakens the cornea. Stephanie Brown, Verywell Health, 30 Sep. 2025 See All Example Sentences for cornea

Word History

Etymology

Middle English, borrowed from Medieval Latin (short for cornea tēla "horny web," cornea tunica "horny covering," translating Greek kerātoeidḕs chitṓn), from feminine of Latin corneus "horny" — more at corneous

First Known Use

14th century, in the meaning defined above

Time Traveler
The first known use of cornea was in the 14th century

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Cite this Entry

“Cornea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cornea. Accessed 29 Oct. 2025.

Kids Definition

cornea

noun
cor·​nea ˈkȯr-nē-ə How to pronounce cornea (audio)
: the transparent part of the coat of the eyeball that covers the iris and pupil and lets light through to the interior
corneal adjective

Medical Definition

cornea

noun
cor·​nea ˈkȯr-nē-ə How to pronounce cornea (audio)
: the transparent part of the coat of the eyeball that covers the iris and pupil and admits light to the interior
corneal adjective

More from Merriam-Webster on cornea

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