Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An image of external objects fixed on the retina by the photochemical action of light on the visual purple.

from the GNU version of the Collaborative International Dictionary of English

  • n. An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See optography.

from The 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.

Etymologies

Ancient Greek (Wiktionary)

Examples

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