retina

noun
ret·​i·​na | \ ˈre-tə-nə How to pronounce retina (audio) , ˈret-nə \
plural retinas also retinae\ ˈre-​tə-​ˌnē How to pronounce retina (audio) , -​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 The scientists were able to prove that photosensitive neuron cells in the retina can respond to light up to five hours after death. Joshua Hawkins, BGR, 16 May 2022 Or the sensation in the retina when a ray of sunlight slips between mountain peaks and illuminates a high-altitude landscape. Los Angeles Times, 12 May 2022 Although painless and often no cause for alarm, such symptoms can signal a tear in the retina, the layer of tissue at the back of the eye that processes light and sends images to the brain. Laura Landro, WSJ, 16 Apr. 2022 Retinal vascular occlusions are caused when blood clots or fat deposits block blood vessels in the retina, the part of the eye that receives light and transmits images to the brain. Zachary Snowdon Smith, Forbes, 14 Apr. 2022 The suprachiasmatic nucleus is wired directly to the retina, and in the 1980s, it was confirmed that the brain clock could be calibrated by sunlight or artificial light, which signals when it’s daytime. New York Times, 6 July 2022 Sue recalls her mother toiling to find a treatment, conducting research, visiting retina specialists and calling doctors. Forbes, 5 July 2022 These essential fatty acids are a major component of our brain, eye retina, skin and nails. Dr. Michael Daignault, USA TODAY, 30 June 2022 Most were painted Rosso Corsa red, some were Nero black and a handful were retina-searing Gallo Modena yellow. Howard Walker, Robb Report, 24 June 2022 See More

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.

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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Time Traveler for retina

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

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Dictionary Entries Near retina

retin-

retina

retinaculate

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Last Updated

1 Aug 2022

Cite this Entry

“Retina.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/retina. Accessed 15 Aug. 2022.

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More Definitions for retina

retina

noun
ret·​i·​na | \ ˈre-tə-nə How to pronounce retina (audio) \
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 How to pronounce retina (audio) \
plural retinas also retinae\ -​ᵊn-​ˌē How to pronounce retina (audio) \

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 How to pronounce Retin-A (audio) \

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

used for a preparation of tretinoin

More from Merriam-Webster on 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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