- any of several compounds that form the protein component of the light-sensitive retina pigment, rhodopsin.
Origin of opsin
First recorded in 1950–55; probably back formation from rhodopsin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the protein that together with retinene makes up the purple visual pigment rhodopsin
C20: back formation from rhodopsin
- A protein of the retina, especially the protein constituent of rhodopsin, that makes up one of the visual pigments.