Dictionary

opsin

noun op·sin \ˈäp-sən\

Definition of OPSIN

:  any of various colorless proteins that in combination with retinal or a related prosthetic group form a visual pigment (as rhodopsin) in a reaction reversible by light

Origin of OPSIN

probably from rhodopsin
First Known Use: 1951

opsin

noun op·sin \ˈäp-sən\   (Medical Dictionary)

Medical Definition of OPSIN

:  any of various colorless proteins that in combination with retinal or a related prosthetic group form a visual pigment (as rhodopsin) in a reaction which is reversed by light

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