Century Dictionary and Cyclopedia
- n. A persistent image formed on the retina by the bleaching of the visual purple. It may be made permanent by immediately immersing the retina in a solution of potash alum.
- n. physiology An image of external objects fixed on the retina by the photochemical action of light on the visual purple.
GNU Webster's 1913
- n. (Physiol.) An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See optography.
- Ancient Greek (Wiktionary)
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