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Definitions for Pion

[1] the first meson to be discovered: it has spin 0 and may be positively or negatively charged or neutral; charged pions decay into a muon and a neutrino or antineutrino. Symbol : π
[2] physics a meson having a positive or negative charge and a rest mass 273.13 times that of the electron, or no charge and a rest mass 264.14 times that of the electron

Words nearby Pion

pinyon jay, pinza, pinzón, pio, piolet, pion, pioneer, pioneer day, pioneers, the, piopio, piosity

Origin of Pion

First recorded in 1950–55; pi (meson) + -on1

Word origin for Pion

C20: from Greek letter pi 1 + on