optical illusion

noun

plural optical illusions
: a misleading image presented to the vision
Zebras look like optical illusions to me. Which are they—black with white stripes or white with black stripes?Al Robinson
The sun, moon, and planets circle above the terrestrial plane in the region of the equator. Their apparent rising and setting is an optical illusion caused by atmospheric refraction …Ranger Rick

Examples of optical illusion in a Sentence

The closer building looks larger than the farther one, but it's just an optical illusion. The two buildings are actually the same size.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Instead, Burke had been fooled by a very convincing optical illusion. Jack Beresford, MSNBC Newsweek, 17 July 2025 For a bronze glow, apply a thin layer straight down the center of your arms and legs for a beauty optical illusion that gives the appearance of length and smoothness. Marie Lodi, Allure, 16 July 2025 Doherty has studied one particular puzzle for years called the Ebbinghaus illusion, an optical illusion which shows how size perception can be manipulated using surrounding shapes. Bradley Blackburn, CBS News, 13 June 2025 And Janelle Monáe, a walking optical illusion stunned in her two-in-one Thom Browne suit featuring an exaggerated structuring, a style creative and imaginative, just like her. Taryn Finley, Refinery29, 6 May 2025 See All Example Sentences for optical illusion

Word History

First Known Use

1763, in the meaning defined above

Time Traveler
The first known use of optical illusion was in 1763

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Cite this Entry

“Optical illusion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/optical%20illusion. Accessed 29 Jul. 2025.

Kids Definition

optical illusion

noun

Medical Definition

optical illusion

noun
: visual perception of a real object in such a way as to misinterpret its actual nature

More from Merriam-Webster on optical illusion

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