Definitions

from The Century Dictionary.

  • Of or pertaining to the retina: as, retinal structure; retinal expansion; retinal images.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Anat.) Of or pertaining to the retina.
  • adjective (Physiol. Chem.) the visual purple.
  • noun (Chem.) A retinoid compound (C20H28O), closely related to vitamin A, which is a component of the visual pigments in the eye. It is also called retinaldehyde and vitamin A aldehyde.

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

  • adjective Of or pertaining to the retina.
  • noun biochemistry One of several yellow or red carotenoid pigments formed from rhodopsin by the action of light; retinene

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

  • adjective in or relating to the retina of the eye
  • noun either of two yellow to red retinal pigments formed from rhodopsin by the action of light

Etymologies

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