positron
noun
pos·i·tron
ˈpä-zə-ˌträn 
: a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron
called also antielectron
Examples of positron in a Sentence
Recent Examples on the Web
Neutron stars also have some of the strongest magnetic fields known in the universe — up to 10 trillion times the power of a refrigerator magnet, and enough turn gamma rays into electrons and positrons in a way manmade particle accelerators cannot hope to do, NASA explained.
—
Adam Harrington, CBS News, 9 Feb. 2026
That was because gamma-ray photons, individual particles of light, were rapidly transformed into pairs of electrons and positrons.
—Robert Lea, Space.com, 4 Feb. 2026
Pending a final decision by the CERN Council in 2028, construction of the initial electron-positron phase (FCC-ee) is slated to begin in 2030, with operations likely to launch in 2047.
—Mrigakshi Dixit, Interesting Engineering, 20 Jan. 2026
Antiprotons and positrons make up antimatter atoms, or anti-atoms.
—Dipangkar Dutta, The Conversation, 15 Dec. 2025
See All Example Sentences for positron
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Adam Harrington, CBS News, 9 Feb. 2026
That was because gamma-ray photons, individual particles of light, were rapidly transformed into pairs of electrons and positrons.
—Robert Lea, Space.com, 4 Feb. 2026
Pending a final decision by the CERN Council in 2028, construction of the initial electron-positron phase (FCC-ee) is slated to begin in 2030, with operations likely to launch in 2047.
—Mrigakshi Dixit, Interesting Engineering, 20 Jan. 2026
Antiprotons and positrons make up antimatter atoms, or anti-atoms.
—Dipangkar Dutta, The Conversation, 15 Dec. 2025
See All Example Sentences for positron
Cite this Entry
“Positron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/positron. Accessed 15 Feb. 2026.
Copy CitationKids Definition
positron
noun
pos·i·tron
ˈpäz-ə-ˌträn
: a positively charged particle having the same mass and size of charge as the electron
Medical Definition
positron
noun
pos·i·tron
ˈpäz-ə-ˌträn
: a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron
called also positive electron
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