Definition of pion in English:

pion

noun ˈpʌɪɒnˈpīˌän

Physics

A meson having a mass approximately 270 times that of an electron.
〔物理〕π介子。亦作PI-MESON
Also called pi-meson
Example sentencesExamples
- In turn, these decay into other subatomic particles, like kaons and pions.
- Kaons and pions are examples of particles known as mesons, which contain a quark and an antiquark.
- A neutral pion consists of a down quark and a down antiquark.
- The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons.
- He worked primarily on the interaction of pions with protons.

Derivatives

pionic

adjective pʌɪˈɒnɪk

Physics

In other words, the pionic system, having its specific ground state and elementary pionic excitations converts rapidly into free pions.
Example sentencesExamples
- Pionic atoms are exotic systems in which a negatively charged pion is bound in an atom-like orbital.

Origin

1950s: from pi¹ (the letter used as a symbol for the particle) + -on.

Definition of pion in US English:

pion

nounˈpīˌän

Physics

A meson having a mass approximately 270 times that of an electron.
〔物理〕π介子。亦作PI-MESON
Also called pi meson
Example sentencesExamples
- A neutral pion consists of a down quark and a down antiquark.
- The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons.
- He worked primarily on the interaction of pions with protons.
- Kaons and pions are examples of particles known as mesons, which contain a quark and an antiquark.
- In turn, these decay into other subatomic particles, like kaons and pions.

Origin

1950s: from pi (the letter used as a symbol for the particle) + -on.

词汇	pion
释义	Definition of pion in English: pion noun ˈpʌɪɒnˈpīˌän Physics A meson having a mass approximately 270 times that of an electron. 〔物理〕π介子。亦作PI-MESON Also called pi-meson Example sentencesExamples In turn, these decay into other subatomic particles, like kaons and pions. Kaons and pions are examples of particles known as mesons, which contain a quark and an antiquark. A neutral pion consists of a down quark and a down antiquark. The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons. He worked primarily on the interaction of pions with protons. Derivatives pionic adjective pʌɪˈɒnɪk Physics In other words, the pionic system, having its specific ground state and elementary pionic excitations converts rapidly into free pions. Example sentencesExamples Pionic atoms are exotic systems in which a negatively charged pion is bound in an atom-like orbital. Origin 1950s: from pi¹ (the letter used as a symbol for the particle) + -on. Definition of pion in US English: pion nounˈpīˌän Physics A meson having a mass approximately 270 times that of an electron. 〔物理〕π介子。亦作PI-MESON Also called pi meson Example sentencesExamples A neutral pion consists of a down quark and a down antiquark. The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons. He worked primarily on the interaction of pions with protons. Kaons and pions are examples of particles known as mesons, which contain a quark and an antiquark. In turn, these decay into other subatomic particles, like kaons and pions. Origin 1950s: from pi (the letter used as a symbol for the particle) + -on.
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