"lightning detector" meaning in English

{
  "forms": [
    {
      "form": "lightning detectors",
      "tags": [
        "plural"
      ]
    }
  ],
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      "args": {},
      "expansion": "lightning detector (plural lightning detectors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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          "name": "Terms with Finnish translations",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Lightning",
          "orig": "en:Lightning",
          "parents": [
            "Electricity",
            "Weather",
            "Electromagnetism",
            "Atmosphere",
            "Physics",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A device that provides an alarm to inform its user(s) that lightning has occurred nearby. Specific devices are available for a variety of applications."
      ],
      "id": "en-lightning_detector-en-noun-VOeMEXWs",
      "links": [
        [
          "device",
          "device"
        ],
        [
          "alarm",
          "alarm"
        ],
        [
          "lightning",
          "lightning"
        ]
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "device",
          "word": "ukkostutka"
        }
      ]
    }
  ],
  "word": "lightning detector"
}

{
  "forms": [
    {
      "form": "lightning detectors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "lightning detector (plural lightning detectors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English entries with incorrect language header",
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        "English multiword terms",
        "English nouns",
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        "Pages with 1 entry",
        "Terms with Finnish translations",
        "en:Lightning"
      ],
      "glosses": [
        "A device that provides an alarm to inform its user(s) that lightning has occurred nearby. Specific devices are available for a variety of applications."
      ],
      "links": [
        [
          "device",
          "device"
        ],
        [
          "alarm",
          "alarm"
        ],
        [
          "lightning",
          "lightning"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "device",
      "word": "ukkostutka"
    }
  ],
  "word": "lightning detector"
}