af·ter·im·age

[af-ter-im-ij, ahf-]
noun Psychology.
a visual image or other sense impression that persists after the stimulus that caused it is no longer operative.

Origin:
1875–80; translation of German Nachbild; see after, image

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Collins
World English Dictionary
afterimage (ˈɑːftərˌɪmɪdʒ) [Click for IPA pronunciation guide]
 
n
aftersensation, Also called: photogene a sustained or renewed sensation, esp visual, after the original stimulus has ceased

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Afterimage is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.
American Heritage
Medical Dictionary

afterimage af·ter·im·age (āf'tər-ĭm'ĭj)
n.
A visual image that persists after the visual stimulus causing it has ceased to act. Also called photogene.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

afterimage

visual illusion in which retinal impressions persist after the removal of a stimulus, believed to be caused by the continued activation of the visual system. The afterimage may be positive, corresponding in colour or brightness to the original image, or negative, being less bright or of colours complementary to the original. A common afterimage is the spot of light one sees after a camera flash has been fired. The afterimage is the most readily observed of the class of phenomena known as aftersensations, or aftereffects.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Afterimage is a persisting sensation or image perceived after the correlated
  physical stimulus has been removed.
Its neck twisted and it dropped to the deck, leaving only its own afterimage
  and a small drop of blood.
The afterimage you see is comprised of complementary colors.
It is the afterimage of the dance rather than the dance itself which is the
  true subject of the review.
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