Share this entry
opsin Syllabification: op·sin
Pronunciation: /ˈäpsən/

Definition of opsin in English:


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.

Definition of opsin in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove adverts and access premium resources