First Known Use: 1951
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
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Origin of OPSIN
probably from rhodopsin
Medical Dictionary
opsin
noun op·sin \ˈäp-sən\
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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