n.
A protein of the retina, especially the protein constituent of rhodopsin, that makes up one of the visual pigments.
[Probably back-formation from RHODOPSIN.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
