rhodopsin noun. [rǝ(ʊ)'dɒpsɪn] L19.
[from RHODO- + Greek opsis sight, vision + -IN¹.]
Biochemistry. A purplish-red light-sensitive pigment found in the retina of humans and in many other animal groups, consisting of a protein (opsin) bonded to a prosthetic group (retinal) which is liberated by the action of light. Also called visual purple.

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