Medical Dictionary
rhodopsin
noun rho·dop·sin \rō-ˈdäp-sən\
Medical Definition of RHODOPSIN
: a red photosensitive pigment in the retinal rods of marine fishes and most higher vertebrates that is important in vision in dim light, is quickly bleached by light to a mixture of opsin and retinal, and is regenerated in the dark—called also visual purple
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