retinal

¹ American  

[ret-n-uhl] / ˈrɛt n əl /

adjective

1. of or relating to the retina of the eye.

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retinal ² American  

[ret-n-al, -awl] / ˈrɛt nˌæl, -ˌɔl /

Also retinene

noun

Biochemistry.

1. an orange pigment, C 2 0 H 2 8 O, that is the active component of rhodopsin and is liberated upon the absorption of light in the vision cycle; vitamin A aldehyde.

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Etymology

Origin of retinal¹

First recorded in 1830–40; retin(a) + -al ¹

Origin of retinal²

First recorded in 1940–45; retin(a) + -al ³

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Example Sentences

See Examples For:

retinal

Instead of relying entirely on animal experiments, they grew miniature versions of human retinal tissue called organoids.

From Science Daily ● Oct. 31, 2026

The foveola contains red and green cones but lacks blue cones, which are found in other retinal regions.

From Science Daily ● Oct. 31, 2026

One major obstacle is that commonly studied animals, including mice and fish, do not share the same retinal organization found in humans.

From Science Daily ● Oct. 31, 2026

"I never saw someone engaged in a strong moral or ethical quest," says Olivier Marre, who worked with Amodei at Princeton on a retinal analysis device.

From Barron's ● Oct. 2, 2026

It didn’t take me very long to completely erase the Bryce Lynch identity and copy my fingerprints and retinal patterns back over to my original citizen profile.

From "Ready Player One: A Novel" by Ernest Cline

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