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retinal

 [ret-n-uhl]  

ret·i·nal

1   [ret-n-uhl]
adjective
of or pertaining to the retina of the eye.
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Origin:
1830–40; retin(a) + -al1

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Retinal is always a great word to know.
So is ninnyhammer. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
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Dictionary.com Unabridged

ret·i·nal

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] .

Origin:
1940–45; retin(a) + -al3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To Retinal
Collins
World English Dictionary
retina (ˈrɛtɪnə)
 
—n , pl -nas, -nae
the light-sensitive membrane forming the inner lining of the posterior wall of the eyeball, composed largely of a specialized terminal expansion of the optic nerve. Images focused here by the lens of the eye are transmitted to the brain as nerve impulses
 
[C14: from Medieval Latin, perhaps from Latin rēte net]
 
'retinal
 
—adj

retinene or retinal (ˈrɛtɪˌniːn, ˈrɛtɪnəl)
 
—n
the aldehyde form of the polyene retinol (vitamin A) that associates with the protein opsin to form the visual purple pigment rhodopsin
 
[C20: from retina + -ene]
 
retinal or retinal
 
—n
 
[C20: from retina + -ene]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

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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