"導火線" meaning in Japanese

{
  "forms": [
    {
      "form": "導火線",
      "ruby": [
        [
          "導",
          "どう"
        ],
        [
          "火",
          "か"
        ],
        [
          "線",
          "せん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "dōkasen",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "どうかせん"
      },
      "expansion": "導(どう)火(か)線(せん) • (dōkasen)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "fuse (cord)"
      ],
      "id": "en-導火線-ja-noun-8Llfv7Nj",
      "links": [
        [
          "fuse",
          "fuse"
        ]
      ]
    }
  ],
  "word": "導火線"
}

{
  "forms": [
    {
      "form": "導火線",
      "ruby": [
        [
          "導",
          "どう"
        ],
        [
          "火",
          "か"
        ],
        [
          "線",
          "せん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "dōkasen",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "どうかせん"
      },
      "expansion": "導(どう)火(か)線(せん) • (dōkasen)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with fifth grade kanji",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with three Han script characters"
      ],
      "glosses": [
        "fuse (cord)"
      ],
      "links": [
        [
          "fuse",
          "fuse"
        ]
      ]
    }
  ],
  "word": "導火線"
}