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opsin

[op-sin] /ˈɒp sɪn/
noun, Biochemistry
1.
any of several compounds that form the protein component of the light-sensitive retina pigment, rhodopsin.
Origin
1950-1955
1950-55; probably back formation from rhodopsin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for opsin

opsin

/ˈɒpsɪn/
noun
1.
the protein that together with retinene makes up the purple visual pigment rhodopsin
Word Origin
C20: back formation from rhodopsin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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opsin in Medicine

opsin op·sin (ŏp'sĭn)
n.
A protein of the retina, especially the protein constituent of rhodopsin, that makes up one of the visual pigments.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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