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retinal purple is a noun meaning "a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light". It carries one recorded sense.
a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light
Definitions, synonyms and semantic relations for retinal purple come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.