noun Biochemistry.
a bright-red photosensitive pigment found in the rod-shaped cells of the retina of certain fishes and most higher vertebrates: it is broken down by the action of dim light into retinal and opsin.
Also called visual purple.

1885–90; rhod- + Greek óps(is) sight, vision + -in2

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World English Dictionary
rhodopsin (rəʊˈdɒpsɪn)
See also iodopsin Also called: visual purple a red pigment in the rods of the retina in vertebrates. It is dissociated by light into retinene, the light energy being converted into nerve signals, and is re-formed in the dark
[C20: from rhodo- + -opsis + -in]

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American Heritage
Medical Dictionary

rhodopsin rho·dop·sin (rō-dŏp'sĭn)
A thermolabile protein that is sensitive to red light and is found in the external segments of the rods of the retina of the eye. Also called visual purple.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
He has also found numerous genes for versions of rhodopsin.
The visual purple or rhodopsin is found only in the outer segments.
The action of a photon on a rhodopsin molecule in a retinal cell has some quantum mechanical interpretations, and so forth.
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