plural retinas also retinae
ˈre-tə-ˌnē 
-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
Examples of retina in a Sentence
Recent Examples on the Web
This helps assess the retina's thickness and detect signs of macular degeneration and new blood vessel growth.
—
Mark Gurarie, Verywell Health, 7 Apr. 2025
In some cases, similar forces occur in the back of the eye, and hemorrhages in the retina can occur.
—Lori Frasier, The Conversation, 19 Mar. 2025
On the other hand, proper viewing glasses and other necessary safety precautions are important while observing a solar eclipse as the powerful rays of the sun can burn and damage your retinas.
—Saman Shafiq, USA TODAY, 13 Mar. 2025
Then a solution containing the viral vector is injected under the retina so that the virus can get to work installing the new genetic code into the photoreceptor cells.
—Tom Rogers, Newsweek, 21 Feb. 2025
See All Example Sentences for retina
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Mark Gurarie, Verywell Health, 7 Apr. 2025
In some cases, similar forces occur in the back of the eye, and hemorrhages in the retina can occur.
—Lori Frasier, The Conversation, 19 Mar. 2025
On the other hand, proper viewing glasses and other necessary safety precautions are important while observing a solar eclipse as the powerful rays of the sun can burn and damage your retinas.
—Saman Shafiq, USA TODAY, 13 Mar. 2025
Then a solution containing the viral vector is injected under the retina so that the virus can get to work installing the new genetic code into the photoreceptor cells.
—Tom Rogers, Newsweek, 21 Feb. 2025
See All Example Sentences for retina
Cite this Entry
“Retina.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/retina. Accessed 20 Apr. 2025.
Copy CitationKids Definition
retina
noun
ret·i·na
ˈret-ᵊn-ə
ˈret-nə
plural retinas also retinae
-ᵊn-ˌē
-ˌī
: the light-sensitive inner layer lining the back of the eye that contains the rods and cones and converts the images formed by the lens into signals which reach the brain by way of the optic nerve
retinal
adjective
-ᵊn-əl
-nəl
Medical Definition
retina
1 of 2 noun
ret·i·na
ˈret-ᵊn-ə, ˈret-nə
plural retinas also retinae
-ᵊn-ˌē
: 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
2 of 2 trademark
Ret·in-A
ˌret-ᵊn-ˈā
—used for a preparation of tretinoin
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