retinal purple

from WordNet (r) 3.0 (2006)

retinal purple
    n 1: a red photopigment in the retinal rods of vertebrates;
         dissociates into retinene by light [syn: {visual purple},
         {rhodopsin}, {retinal purple}]

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]

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