Definitions for optical illusion
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Random House Webster's College Dictionary
op′tical illu′sion(n.)
Category: Psychology
Ref: See under illusion (def. 4). 4
Origin of optical illusion:
1785–95
Princeton's WordNet
optical illusion(noun)
an optical phenomenon that results in a false or deceptive visual impression
Wiktionary
optical illusion(Noun)
An image that is visually deceptive or misleading.
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"optical illusion." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/optical illusion>.