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visual purple
visual purple
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Word History and Origins
Origin of visual purple1
First recorded in 1895–1900
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Example Sentences
There is a dark pigment in the retina, called the visual purple, which changes color in the light, and so forms the image.
From Project Gutenberg
In the outer part of the rods the visual purple or rhodopsin is found.
From Project Gutenberg
A light-sensitive liquid (visual purple) and cellular and fibrous layers complete the retinal structure.
From Project Gutenberg
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