noun Biochemistry.
a photosensitive violet pigment that occurs in the cones of the retina and is transformed by light into retinal and an opsin protein.
Compare rhodopsin.

1935–40; < Greek īṓd(ēs) taken as derivative of íon violet (see iodine) + opsin, on the pattern of rhodopsin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
iodopsin (ˌaɪəˈdɒpsɪn)
See also rhodopsin Also called: visual violet a violet light-sensitive pigment in the cones of the retina of the eye that is responsible for colour vision

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

iodopsin i·o·dop·sin (ī'ə-dŏp'sĭn)
A violet, light-sensitive visual pigment found in the cones of the retina. Also called visual violet.

The American Heritage® Stedman's Medical Dictionary
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