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单词 pion
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WordReference Random House Unabridged Dictionary of American English © 2024
pi•on  (pī′on),USA pronunciation n. [Physics.]
  1. Physicsthe 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  Also called pi meson. 
  • pi (meson) + -on1 1950–55

Collins Concise English Dictionary © HarperCollins Publishers::
pion /ˈpaɪɒn/, pi meson n
  1. 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
Etymology: 20th Century: from Greek letter pi1 + on
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更新时间：2025/7/31 21:03:43