retinal

from WordNet (r) 3.0 (2006)

retinal
    adj 1: in or relating to the retina of the eye; "retinal cells"
    n 1: either of two yellow to red retinal pigments formed from
         rhodopsin by the action of light [syn: {retinene},
         {retinal}]

from The Collaborative International Dictionary of English v.0.48

Retinal \Ret"i*nal\, a. (Anat.)
   Of or pertaining to the retina.
   [1913 Webster]

   {Retinal purple} (Physiol. Chem.), the visual purple.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Retinal \Ret"i*nal\, n. (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}.
   [PJC]

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