"spinthariscope" meaning in English

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  "etymology_text": "Ancient Greek [Term?] (“spark”) + -scope.",
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    {
      "form": "spinthariscopes",
      "tags": [
        "plural"
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "An early device for observing individual nuclear disintegrations."
      ],
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          "observing",
          "observe"
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          "nuclear",
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          "disintegration",
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        "(historical) An early device for observing individual nuclear disintegrations."
      ],
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        "historical"
      ],
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        "spinthariscope"
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  "word": "spinthariscope"
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  "etymology_text": "Ancient Greek [Term?] (“spark”) + -scope.",
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    {
      "form": "spinthariscopes",
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        "An early device for observing individual nuclear disintegrations."
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        "(historical) An early device for observing individual nuclear disintegrations."
      ],
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