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pi·on AHD[pīʹŏn'] D.J.[ˈpaɪˌɒn]K.K.[ˈpaɪˌɑn]n.Physics（名词）【物理学】- A semistable meson produced either in a neutral form with a mass 264 times that of an electron and a mean lifetime of 8.4 × 10-17 second or in a positively charged form with a mass 273 times that of an electron and a mean lifetime of 2.6 × 10 -8 second. Also called pi meson See table at subatomic particle π介子：一种半稳定介子，或者以一种质量比电子重264倍的中性形式生成，其平均寿命期为8.4×10-17秒；或者以一种质量比电子重273倍的正电极形式生成，其平均寿命期为2.6×10 -8秒 也作 pi meson 参见 subatomic particle
- Contraction of pi meson pi meson的缩写
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