Etymology of pion

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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        "2": "pi",
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    [
      "pi",
      "pi#English"
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      "-on",
      "-on#English"
    ],
    [
      "pi-meson",
      "pi-meson#English"
    ]
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  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "Any of three semistable mesons, having positive, negative or neutral charge, composed of up and down quarks/antiquarks."
      ],
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        "particle"
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