Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A violet, light-sensitive pigment found in the retinal cones of the eye.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A photoreceptor protein found in the cone cells of the retina, the basis of colour vision.

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

  • noun a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision

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