Definitions for visual purple
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Random House Webster's College Dictionary
vis′ual pur′ple(n.)
Ref: rhodopsin.
Origin of visual purple:
1895–1900
Princeton's WordNet
visual purple, rhodopsin, retinal purple(noun)
a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light
Wiktionary
visual purple(Noun)
The pigment rhodopsin.
Citation
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"visual purple." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/visual purple>.

