Medical Dictionary
2retinal
noun ret·i·nal \ˈret-ən-ˌal, -ˌȯl\
Medical Definition of RETINAL
: 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
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