retina

noun
ret·i·na | \ˈre-tə-nə, ˈret-nə\
plural retinas also retinae\ˈre-tə-ˌnē, -ˌnī \

Definition of retina 

: the sensory membrane that lines the eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve — see eye illustration

Examples of retina in a Sentence

Recent Examples on the Web

With Akka's futuristic concept, passengers would board a train-like tube at a neighborhood station and have their retinas scanned for security during the ride to the airport. Marie Mawad And Ania Nussbaum, chicagotribune.com, "Flying trains could be coming your way," 11 July 2018 The buckle will help to reattach the retina to the surface of the eye. Natalie Stone, PEOPLE.com, "Mama June Undergoes Emergency Eye Surgery as She Worries About Going Blind," 16 Feb. 2018 So there’s a lot of neuroscience about how vision works and how the eye and retina and visual cortex work, but none of that says anything about the conscious experience of seeing. Angela Chen, The Verge, "A neuroscientist explains why we need better ways to talk about emotions," 6 July 2018 The world casts its light through the cornea and lens and onto the retina, a paper-thin mask of tissue at the back of the eye made of the same cells that make up the brain. Cate Mcquaid, BostonGlobe.com, "A different sort of scan in ‘The Beautiful Brain’," 6 June 2018 Some use chlorophyll to convert sunlight during photosynthesis and others use rhodopsins, proteins that bind to a form of vitamin A called retina to capture light. Shandria Sutton, Science | AAAS, "New ‘light-eating’ protein discovered in the Sea of Galilee," 5 July 2018 The blast left the front part of Northup's eye deformed, damaging the cornea and bruising the retina. Ashley Welch, CBS News, "Fireworks display gone wrong nearly cost firefighter his vision," 29 June 2018 Shannon says the vision loss in her right eye is the result of childhood cataracts that were never properly treated, and her left was damaged by retinal detachment, a disorder of the eye in which the retina separates from the layer underneath. Emily Strohm, PEOPLE.com, "Mama June Says She Gained 25 Lbs. Because She Is Going Blind and Can't Exercise," 13 June 2018 The cornea's function is to focus light on the retina at the back of the eye. Author: Roni Caryn Rabin, Anchorage Daily News, "Blurred vision, burning eyes: This is a Lasik success?," 12 June 2018

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

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First Known Use of retina

14th century, in the meaning defined above

History and Etymology for retina

Middle English rethina, from Medieval Latin retina, probably from Latin rete net

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Dictionary Entries near retina

retimber

retime

retin-

retina

retinaculate

retinaculum

retinal

Statistics for retina

Last Updated

16 Oct 2018

Look-up Popularity

Time Traveler for retina

The first known use of retina was in the 14th century

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More Definitions for retina

retina

noun

English Language Learners Definition of retina

: the sensitive tissue at the back of the eye that receives images and sends signals to the brain about what is seen

retina

noun
ret·i·na | \ˈre-tə-nə \
plural retinas also retinae\-ˌnē \

Kids Definition of retina

: the membrane that lines the back part of the eyeball, contains the rods and cones, and converts the images received by the lens into signals that are transmitted to the brain

retina

noun
ret·i·na | \ˈret-ᵊn-ə, ˈret-nə \
plural retinas also retinae\-ᵊn-ˌē \

Medical Definition of retina 

(Entry 1 of 2)

: the sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve

Retin-A

trademark
Ret·in-A | \ˌret-ᵊn-ˈā \

Medical Definition of Retin-A (Entry 2 of 2)

used for a preparation of tretinoin

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More from Merriam-Webster on retina

Spanish Central: Translation of retina

Nglish: Translation of retina for Spanish Speakers

Britannica English: Translation of retina for Arabic Speakers

Britannica.com: Encyclopedia article about retina

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