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Definitions from the WebPi-MesonDescription:A pi-meson is a subatomic particle also known as a pion. It belongs to the meson family of particles and is composed of a quark and an antiquark. Pi-mesons come in three types: the positively charged pi-plus meson (π+), the negatively charged pi-minus meson (π−), and the electrically neutral pi-zero meson (π^0). Sample Sentences:
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