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2 definitions found
 for 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]

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]

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