antiparticle

noun
an·​ti·​par·​ti·​cle | \ ˈan-tē-ˌpär-ti-kəl, ˈan-ˌtī- How to pronounce antiparticle (audio) \

Definition of antiparticle

: a subatomic particle identical to another subatomic particle in mass but opposite to it in electric and magnetic properties (such as sign of charge) that when brought together with its counterpart produces mutual annihilation especially : a subatomic particle not found in ordinary matter

Examples of antiparticle in a Sentence

Recent Examples on the Web This leaves behind the second square’s opposite side, also consisting of a particle and an antiparticle. Quanta Magazine, 26 July 2021 This leaves behind the second square’s opposite side, also consisting of a particle and an antiparticle. Quanta Magazine, 26 July 2021 In the first step of this fusion process, two protons inside the sun fuse into a deuteron while giving off a neutrino and a positron—the antiparticle of the electron. Scientific American, 1 Feb. 2022 The antiparticle version of an electron, for instance, is a positron. Caroline Delbert, Popular Mechanics, 21 Sep. 2021 The resultant movement is that of a particle-antiparticle pair moving sideways in a straight line. Thomas Lewton, Wired, 1 Aug. 2021 This self-annihilation is like that of a particle and antiparticle pair, except that here both members of the pair are identical. Quanta Magazine, 29 Sep. 2021 This leaves behind the second square’s opposite side, also consisting of a particle and an antiparticle. Thomas Lewton, Wired, 1 Aug. 2021 In these early stages, every set of particle-antiparticle pairs has both a creation rate and an annihilation rate. Ethan Siegel, Forbes, 2 Sep. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'antiparticle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of antiparticle

1934, in the meaning defined above

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Time Traveler for antiparticle

Time Traveler

The first known use of antiparticle was in 1934

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Dictionary Entries Near antiparticle

antiparasitic

antiparticle

anti-party

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Statistics for antiparticle

Last Updated

17 May 2022

Cite this Entry

“Antiparticle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antiparticle. Accessed 17 May. 2022.

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More from Merriam-Webster on antiparticle

Britannica.com: Encyclopedia article about antiparticle

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