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.
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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.

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ocellus omega-3 fatty acid ophthalmodynamometer rhodopsin vitamin A aldehyde

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