retinal

[ ret-n-uh l ]

/ ˈrɛt n əl /

adjective

of or relating to the retina of the eye.

Nearby words

retinaculum of fibular muscles, retinaculum of flexor muscles, retinaculum of peroneal muscles, retinaculum of skin, retinaculum tendinum, retinal, retinal adaptation, retinal cone, retinal detachment, retinal isomerase, retinal rivalry

Origin of retinal

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

Definition for retinal (2 of 2)

retinal

[ ret-n-al, -awl ]

/ ˈrɛt nˌæl, -ˌɔl /

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

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

Word Origin and History for retinal

retinal

adj.

1838; see retina + -al (1).

Medicine definitions for retinal

retinal

[ rĕt′n-ăl′, -ôl′ ]

n.

retinaldehyde