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retinoid
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retinal (2)
ret·i·nal [ rétt'n'l ] or ret·i·nene [ rétt'n n ]


noun 
Definition:
 
component of visual pigment: a derivative of vitamin A that forms part of the light-sensitive pigment in the eye
[Mid-20th century. <retina + -al2]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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