Definition of opsin in English:


Syllabification: op·sin
Pronunciation: /ˈäpsin


  • A protein that forms part of the visual pigment rhodopsin and is released by the action of light.
    More example sentences
    • Rhodopsin consists of a protein called opsin bonded to a pigment called retinal.
    • Vitamin A then combines with a protein opsin to form rhodopsin.
    • Visual pigments are composed of a light-absorbing chromophore that is bound to the protein opsin.


1950s: shortening of rhodopsin.

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Pronunciation: skōSH
a small amount; a little