: a meson that is a combination of up and down quarks and antiquarks, that may be positive, negative, or neutral, and that has a mass about 270 times that of the electron
Examples of pion in a Sentence
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The images showed how quarks carrying different fractions of the pion’s momentum are distributed across the particle.
—
Georgina Jedikovska,
Interesting Engineering,
12 June 2026
Above some critical energy threshold, interactions between those photons and a cosmic ray will be energetic enough that additional particles, like pions, will spontaneously be created.
—
Big Think,
30 Jan. 2026
They are created when protons and neutrons collide, which generates particles known as pions that then decay into muons.
—
IEEE Spectrum,
3 Dec. 2024
This meddling is what allows the kaon to produce a pion and two neutrinos, the process NA62 seeks.
—
Clara Moskowitz,
Scientific American,
1 Oct. 2024
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Georgina Jedikovska,
Interesting Engineering,
12 June 2026
Above some critical energy threshold, interactions between those photons and a cosmic ray will be energetic enough that additional particles, like pions, will spontaneously be created.
—
Big Think,
30 Jan. 2026
They are created when protons and neutrons collide, which generates particles known as pions that then decay into muons.
—
IEEE Spectrum,
3 Dec. 2024
This meddling is what allows the kaon to produce a pion and two neutrinos, the process NA62 seeks.
—
Clara Moskowitz,
Scientific American,
1 Oct. 2024
Cite this Entry
“Pion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pion. Accessed 5 Jul. 2026.
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