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opsin

[op-sin]
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noun Biochemistry.
  1. any of several compounds that form the protein component of the light-sensitive retina pigment, rhodopsin.
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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
British Dictionary definitions for opsin

opsin

noun
  1. the protein that together with retinene makes up the purple visual pigment rhodopsin
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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
opsin in Medicine

opsin

(ŏp′sĭn)
n.
  1. A protein of the retina, especially the protein constituent of rhodopsin, that makes up one of the visual pigments.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.