antimatter

noun

an·​ti·​mat·​ter ˈan-tē-ˌma-tər How to pronounce antimatter (audio) ˈan-ˌtī- How to pronounce antimatter (audio)
: matter composed of antiparticles

Examples of antimatter in a Sentence

Recent Examples on the Web
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Earth’s best vacuum CERN currently has several antimatter experiments underway, each producing a different type of antiparticle. Jacopo Prisco, CNN Money, 27 Mar. 2026 According to this, the Big Bang should have created equal amounts of matter and antimatter, which would have destroyed each other, leaving an empty universe. Georgina Jedikovska, Interesting Engineering, 25 Mar. 2026 The feat marks the first time scientists have ever managed to transport antimatter out of the lab—and could help usher in a new era of antimatter discoveries. Emma Gometz, Scientific American, 25 Mar. 2026 Successfully transporting the stuff, at speeds reaching up to 26 miles per hour, is therefore a major win for researchers, who dreamed of hauling stable antimatter since the antimatter factory first opened more than thirty years ago. Joe Wilkins, Futurism, 25 Mar. 2026 See All Example Sentences for antimatter

Word History

First Known Use

1934, in the meaning defined above

Time Traveler
The first known use of antimatter was in 1934

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Cite this Entry

“Antimatter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antimatter. Accessed 3 Apr. 2026.

Kids Definition

antimatter

noun
an·​ti·​mat·​ter ˈant-i-ˌmat-ər How to pronounce antimatter (audio)
: matter whose parts match parts of ordinary matter except in having some opposite properties (as a positive instead of a negative charge)

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