from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sensation of light caused by excitation of the retina by mechanical or electrical means rather than by light, as when the eyeballs are pressed through closed lids.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A sensation of lights caused by mechanical or electrical (rather than optical) stimulation of the retina.
from the GNU version of the Collaborative International Dictionary of English
- n. A luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light, as by pressure upon the eyeball when the lids are closed. Cf. after-image.
from The Century Dictionary and Cyclopedia
- n. The luminous image produced by pressing the eyeball with the finger or otherwise. It is due to the direct mechanical stimulation of the retina.
French phosphène : Greek phōs, light; see phos- + Greek phainein, to cause to appear, to show; see bhā-1 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)