Definition of opsin
: any of various colorless proteins that in combination with retinal or a related prosthetic group form a visual pigment (such as rhodopsin) in a reaction reversible by light
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Origin and Etymology of opsin
probably from rhodopsin
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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Britannica.com: Encyclopedia article about opsin
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