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.
There are a number of optical illusions that pilots have to account for when flying at night, according to the Federal Aviation Administration’s airplane flying handbook. Eleanor Nash, Kansas City Star, 3 Feb. 2025 Two dozen people had been waiting for this moment, passing the time by handling the store’s menagerie of optical illusions, wooden puzzles and magic-adjacent objects. David Segal, New York Times, 7 Jan. 2025 At the last awards ceremony, Heidi Klum wore a gown with cutouts that gave the optical illusion of a bra. Marissa Muller, WWD, 2 Feb. 2025 The last sequence is an astonishing optical illusion to behold. Carlos Aguilar, Los Angeles Times, 31 Dec. 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

Browse Nearby Entries

Cite this Entry

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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!