antimatter

noun

an·​ti·​mat·​ter
ˈan-tē-ˌma-tər,
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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As early as the 1940s, Wheeler had been researching antimatter. Ken Bridges, Austin American-Statesman, 31 Dec. 2024 By producing equal amounts of matter and antimatter, the experiments at RHIC and the LHC have simply deepened the mystery of the matter–antimatter asymmetry in the universe and why the Big Bang favored matter over antimatter. Keith Cooper, Space.com, 25 Dec. 2024 Because of the observed asymmetry between matter and antimatter, most of these cosmic rays are made from matter, but some are formed of antimatter. Keith Cooper, Space.com, 25 Dec. 2024 According to the standard model of physics, that event should have produced equal amounts of matter and antimatter. Eric Baculinao, NBC News, 31 Oct. 2024 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

Dictionary Entries Near antimatter

Cite this Entry

“Antimatter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antimatter. Accessed 21 Jan. 2025.

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)

More from Merriam-Webster on antimatter

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