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retinal1

[ret-n-uh l] /ˈrɛt n əl/
adjective
1.
of or relating to the retina of the eye.
Origin of retinal1
1830-1840
1830-40; retin(a) + -al1

retinal2

[ret-n-al, -awl] /ˈrɛt nˌæl, -ˌɔl/
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.
Also, retinene
[ret-n-een] /ˈrɛt nˌin/ (Show IPA)
.
Origin
1940-45; retin(a) + -al3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for retinal
adj.

1838; see retina + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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retinal in Medicine

retinal ret·i·nal (rět'n-āl', -ôl')
n.
See retinaldehyde.

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