'Retinal purple' definitions:

Definition of 'retinal purple'

(from WordNet)
noun
A red photopigment in the retinal rods of vertebrates; dissociates into retinene by light [syn: visual purple, rhodopsin, retinal purple]

Definition of 'Retinal purple'

From: GCIDE
  • Retinal \Ret"i*nal\, a. (Anat.) Of or pertaining to the retina. [1913 Webster]
  • Retinal purple (Physiol. Chem.), the visual purple. [1913 Webster]