[ roh-dop-sin ]
/ roʊˈdɒp sɪn /

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.

Origin of rhodopsin

1885–90; rhod- + Greek óps(is) sight, vision + -in2
Also called visual purple.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for rhodopsin


/ (rəʊˈdɒpsɪn) /


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 darkAlso called: visual purple See also iodopsin

Word Origin for rhodopsin

C20: from rhodo- + -opsis + -in
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

Medicine definitions for rhodopsin


[ rō-dŏpsĭn ]


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