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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Retinal \Ret"i*nal\, adjective (Anat.) Of or pertaining to the retina.
{Retinal purple} (Physiol. Chem.), the visual purple.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Retinal \Ret"i*nal\, noun (Chem.) A retinoid compound ({C20H28O}), closely related to vitamin A, which is a component of the visual pigments in the eye. It is also called {retinaldehyde} and {vitamin A aldehyde}. [PJC]
From WordNet (r) 2.0 [wn]:
retinal
adjective: in or relating to the retina of the eye; "retinal cells"
noun: either of two yellow to red retinal pigments formed from Rhodopsin by the action of light [syn: {retinene}]
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