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

In April 2001, when reporting on the Sri Lankan civil war, Marie lost her left eye after a grenade landed near her and shrapnel pierced her retina. Janine Di Giovanni, Town & Country, "Hollywood Chameleon Rosamund Pike Tackles the Life Story of War Correspondent Marie Colvin," 15 Nov. 2018 The two-stage AI system takes a more human-like approach to analyzing patients' optical coherence tomography (OCT) scans of their retinas. Christopher Carbone, Fox News, "AI tool 'as good as experts' at detecting eye problems, scientists say," 14 Aug. 2018 Luminar made the cost question harder by making its lidar’s receiver (the that acts like your eye’s retina) out of indium gallium arsenide (InGaAs) instead of silicon. Alex Davies, WIRED, "Luminar's New Lidar Could Bring Vision to Every Robocar in the World," 12 Apr. 2018 The Prada Effect The retina-searing neon dresses, vests, and handbags filling Prada’s shop windows have become something of a beacon. Emily Farra, Vogue, "The 7 Biggest Street Style Trends of Spring 2019," 5 Oct. 2018 Then there’s the related condition diabetic macular edema (DME), a repercussion of diabetic retinopathy that causes a buildup of fluid in a part of the retina called the macula, the NEI explains. Korin Miller, SELF, "This Is How Diabetes Can Affect Your Eyes," 8 Nov. 2018 Would the person then sense light on both sides of the retina? Tim Folger, Discover Magazine, "How Quantum Mechanics Lets Us See, Smell and Touch," 24 Oct. 2018 Caspian was born with a rare, inherited eye disorder called Leber congenital amaurosis, which results in the progressive deterioration of the retina, the tissue at the back of the eye that detects light and color. Sumathi Reddy, WSJ, "High Hopes for a Gene Therapy Come With Fears Over Cost," 24 Sep. 2018 And some research suggests blue light might damage rat retinas. Rachel Becker, The Verge, "Be careful what you believe about screen time making you blind," 17 Aug. 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

25 Dec 2018

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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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