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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
: 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

Example Sentences

Recent Examples on the Web The injections stanch the growth of abnormal, leaky blood vessels that grow under the macula region of the retina, which is responsible for clear central vision. Ron Winslow, WSJ, 4 Sep. 2022 Who can fault an emergency room physician for an AI algorithm that misses papilledema—a swelling of the retina? George Maliha, Scientific American, 29 June 2022 The authentication can also come from a fingerprint or retina scan, neither of which ever leave the end-user device to prevent the biometrics from being stolen. Dan Goodin, Ars Technica, 12 July 2022 And by the time people from historically underrepresented groups are seen by a retina specialist, their condition has often progressed to a more advanced stage. Forbes, 5 July 2022 He was referred to a retina specialist after that surgery, who told him the best option would be to remove his eye. Chloe Peterson, The Arizona Republic, 27 June 2022 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 See More

Word History

Etymology

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

First Known Use

14th century, in the meaning defined above

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

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