retinal

[ret-n-uh l]

adjective

of or relating to the retina of the eye.

Origin of retinal

First recorded in 1830–40; retin(a) + -al¹

retinal

[ret-n-al, -awl]

noun Biochemistry.

an orange pigment, C20H28O, that is the active component of rhodopsin and is liberated upon the absorption of light in the vision cycle; vitamin A aldehyde.

Also ret·i·nene

[ret-n-een] /ˈrɛt nˌin/.

Origin of retinal

First recorded in 1940–45; retin(a) + -al³

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for retinal

Contemporary Examples of retinal

To complement brain wiring, everyone walks around with retinal cams.
The Internet Embedded in Your Head
J.T. Price
November 21, 2014

Historical Examples of retinal

A useful faculty, easily developed by practice, is that of retaining a retinal picture.
Inquiries into Human Faculty and Its Development
Francis Galton
Numerous rhabdomeres (grouped as rhabdoms in Limulus) are found in the retinal layer of the central eyes also.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3
Various
The retinal vessels stand out slightly in relief, and thus a perfect shadow of the system is cast on the retina.
Cleo The Magnificent
Louis Zangwill
Mike the Angel put his face in the rest for the retinal photos.
Unwise Child
Gordon Randall Garrett
The retinal image impresses the retina in some definite manner and the impression is carried to the brain by the optic nerve.
Visual Illusions
Matthew Luckiesh