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.
From the front, the style is simultaneously stunning and mindboggling, almost giving an optical illusion effect. Marci Robin, Allure, 29 Oct. 2024 The dial is rendered in grand feu enamel in a way that creates an optical illusion as the watch moves – the idea is to create the effect of a raindrop falling on the still surface of a pond, with ripples radiating out from the seconds sub-dial. Carol Besler, Robb Report, 23 Oct. 2024 During its rising phase, the moon often appears larger and brighter due to various optical illusions, including the moon illusion, in which our brains misinterpret its size when framed by foreground objects. Tiffany Acosta, The Arizona Republic, 18 Oct. 2024 The entire book seems to flip back and forth, like an optical illusion, from literary novel to genre thriller and back again. Lev Grossman, The Atlantic, 30 Sep. 2024 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

Dictionary Entries Near optical illusion

Cite this Entry

“Optical illusion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/optical%20illusion. Accessed 26 Nov. 2024.

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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