: 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
There’s a very real possibility that neutrinos are also their own antiparticles.
—
Paul Sutter, Ars Technica, 11 June 2024
But through some very complex and exceedingly technical processes, a particle that is its own antiparticle can acquire a mass.
—Paul Sutter, Ars Technica, 11 June 2024
If dark matter particles are also their own antiparticles, as many dark matter theories posit, then within these collapsing clouds, those particles would have collided with one another and self-annihilated.
—Stephanie Pappas, Scientific American, 20 July 2023
The standard model describes how these particles and their antiparticles interact through three forces: electromagnetism, the strong nuclear force that binds quarks, and the weak nuclear force that enables quarks and other particles to decay and change type.
—Byadrian Cho, science.org, 28 Mar. 2024
See all Example Sentences for antiparticle 
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.
Paul Sutter, Ars Technica, 11 June 2024
But through some very complex and exceedingly technical processes, a particle that is its own antiparticle can acquire a mass.
—Paul Sutter, Ars Technica, 11 June 2024
If dark matter particles are also their own antiparticles, as many dark matter theories posit, then within these collapsing clouds, those particles would have collided with one another and self-annihilated.
—Stephanie Pappas, Scientific American, 20 July 2023
The standard model describes how these particles and their antiparticles interact through three forces: electromagnetism, the strong nuclear force that binds quarks, and the weak nuclear force that enables quarks and other particles to decay and change type.
—Byadrian Cho, science.org, 28 Mar. 2024
See all Example Sentences for antiparticle
Dictionary Entries Near antiparticle
Cite this Entry
“Antiparticle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antiparticle. Accessed 3 Dec. 2024.
Copy CitationKids Definition
antiparticle
noun
an·ti·par·ti·cle
ˈant-i-ˌpärt-i-kəl 
ˈan-ˌtī-
: an elementary particle identical to another elementary particle in mass but opposite to it in electric or magnetic properties
Love words? Need even more definitions?
Merriam-Webster unabridged
Share