from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The pigment sensitive to red light in the retinal rods of the eyes, consisting of opsin and retinene. Also called visual purple.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A light-sensitive pigment in the rod cells of the retina; it consists of an opsin protein bound to the carotenoid retinal

from the GNU version of the Collaborative International Dictionary of English

  • n. The visual purple. See under visual.

from The Century Dictionary and Cyclopedia

  • n. Visual purple; a pigment found in the outer segments of the retinal rods.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light


rhod(o)- + Greek opsis, sight; see -opsis + -in.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ῥόδον (rhodon, "rose"), due to its pinkish color, and ὄψις (opsis, "sight"). (Wiktionary)


  • Another protein is rhodopsin, which is found in cells that make up the retina of the eye.

    The Edge of Evolution

  • The scientists were able to see previously unobserved changes in the structure of rhodopsin, which is a model for the ubiquitous G protein coupled receptors (GPCRs), heptahelical, transmembrane receptors found in eukaryotic cells. - latest science and technology news stories

  • Saranak J, Patel N, Zarilli G, Okabe M, et al. (1984) A rhodopsin is the functional photoreceptor for phototaxis in the unicellular eukaryote

    PLoS ONE Alerts: New Articles

  • Blurred vision can be a lack of a light sensitive pigment called rhodopsin, or visual purple, that’s composed of vitamin A and protein.

    Human Eye: Part 4

  • This alters the way in which one of the proteins in the retina—rhodopsin, a pigment responsible for night vision as well as blue-green color vision—behaves.


  • Deyes goes on to discuss rhodopsin before throwing this red hot pepper in the pot:

    Building Trees Sequentially

  • De Santis says their retinal rhodopsin was destroyed.

    Wild Dreams of Reality, 5

  • They have opsins that they use for both light detection (sensory rhodopsin-I and sensory rhodopsin-II) *and* photosynthesis without chlorophyll (bacteriorhodopsin and halorhodopsin).

    Halobacterium salinarum - The Panda's Thumb

  • Surprisingly, it looks as if the critical light-sensitive protein at the centre of it all, rhodopsin, evolved from an ancestor in algae where it is used to calibrate light levels in photosynthesis.

    Nick Lane - 10 things I'd tell Darwin

  • Some bacteria even use rhodopsin for a type of photosynthesis.

    Nick Lane - 10 things I'd tell Darwin


Log in or sign up to get involved in the conversation. It's quick and easy.