Definition of opsin in English:

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Pronunciation: /ˈäpsən/


A protein that forms part of the visual pigment rhodopsin and is released by the action of light.
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.

For editors and proofreaders

Syllabification: op·sin

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