retinal

1
[ret-n-uh l]
|

adjective

of or relating to the retina of the eye.

Origin of retinal

1
First recorded in 1830–40; retin(a) + -al1

retinal

2
[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

2
First recorded in 1940–45; retin(a) + -al3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Word Origin and History for retinal
adj.

1838; see retina + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for retinal

retinal

[rĕtn-ăl′, -ôl′]

n.

retinaldehyde
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.