Definition of pi meson in English:

pi meson

noun

  • another term for pion
    • ‘In 1947, English physicist Cecil Powell observed Yukawa's mesons, now called pi-mesons or pions, in the upper atmosphere, where they were produced by cosmic ray collisions.’
    • ‘If, for example, the interaction between two protons in a nucleus is studied, quite good results can be obtained by describing it as an exchange of pi-mesons.’

Pronunciation:

pi meson

/ˌpī ˈmizän//ˌpī ˈmāzän/