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adj :  of, relating to, involving, or being a retina <a examination>  < rods> 
n :  a yellowish to orange aldehyde C20H28O derived from vitamin A that in combination with proteins forms the visual pigments of the retinal rods and cones - called also retinene , retinene1 , vitamin A aldehyde  .
Similar sounding terms:  ret·i·nol 

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