Found 2 items, similar to retinal purple.
English → English (WordNet) Definition: retinal purple retinal purple n : a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light [syn: visual purple, rhodopsin]
English → English (gcide) Definition: Retinal purple Retinal \Ret"i*nal\, a. (Anat.) Of or pertaining to the retina. [1913 Webster] Retinal purple (Physiol. Chem.), the visual purple. [1913 Webster]