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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So, theoretically, when the universe came into existence, there should have been a 50-50 chance of antimatter or regular matter particles being created. Keith Cooper, Space.com, 24 July 2025 The obvious solution is to move the antimatter away from where it's produced. John Timmer, ArsTechnica, 19 May 2025 He was seemingly vanquished by the Second Doctor (Patrick Troughton) and Third Doctor (Jon Pertwee) in a matter/antimatter explosion. Richard Edwards, Space.com, 24 May 2025 Studying antimatter, therefore, has been extremely difficult. John Timmer, ArsTechnica, 19 May 2025 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 29 Jul. 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)

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