optical illusion

noun

plural optical illusions
Synonyms of optical illusionnext
: 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.
But that proved to be an optical illusion. Paul Sullivan, Chicago Tribune, 29 Mar. 2026 The complications showcased in Schulz-Hildebrandt’s nine dot optical illusion is a great example of a phenomenon called simultaneous contrast. Andrew Paul, Popular Science, 25 Mar. 2026 For the Vanity Fair Oscars afterparty, Kidman changed into a netted gold optical illusion gown, also from Chanel. Lizzie Lanuza, StyleCaster, 18 Mar. 2026 The Teenage Mutant Ninja Turtles actress has been laying low since giving birth last summer, albeit making a surprise appearance in a nude optical illusion corset dress that appeared to be dripping with blood at a special Jennifer’s Body event in October. Lara Walsh, InStyle, 16 Mar. 2026 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 1 Apr. 2026.

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

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