"pyrotron" meaning in English

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  "etymology_text": "From pyro- + -tron.",
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  "lang_code": "en",
  "pos": "noun",
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          "_dis": "82 18",
          "kind": "topical",
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          "name": "Electromagnetism",
          "orig": "en:Electromagnetism",
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            "Physics",
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        {
          "_dis": "71 29",
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          "name": "Nuclear fusion",
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          "name": "Pseudoscience",
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      ],
      "glosses": [
        "A magnetic mirror."
      ],
      "id": "en-pyrotron-en-noun-NoR4i0-e",
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          "physics",
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          "magnetic mirror",
          "magnetic mirror"
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        "(physics) A magnetic mirror."
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          "ref": "2005, James H. Hall, Practically Profound, page XIX:",
          "text": "Spontaneous combustion may sound like “no cause at all;” but it isn't, except, perhaps, for people who allegedly ignite while watching TV. Actually, even for that kind of urban myth, causation is presumed: pyrotrons, of course.",
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        "A notional subatomic particle invented to explain cases of human spontaneous combustion."
      ],
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          "subatomic particle",
          "subatomic particle"
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          "human",
          "human"
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        [
          "spontaneous combustion",
          "spontaneous combustion"
        ]
      ]
    }
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  "word": "pyrotron"
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  ],
  "etymology_text": "From pyro- + -tron.",
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    {
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        "(physics) A magnetic mirror."
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