"duelling pistol" meaning in English

{
  "forms": [
    {
      "form": "duelling pistols",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "duelling pistol (plural duelling pistols)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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            "Entries with incorrect language header",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Firearms",
          "orig": "en:Firearms",
          "parents": [
            "Weapons",
            "Hunting",
            "Military",
            "Tools",
            "Human activity",
            "Society",
            "Technology",
            "Human behaviour",
            "All topics",
            "Human",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "a type of pistol that was manufactured in matching pairs to be used in a duel"
      ],
      "id": "en-duelling_pistol-en-noun-D3ZdwLKB",
      "synonyms": [
        {
          "word": "dueling pistol"
        }
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "type of pistol used in duels",
          "tags": [
            "feminine"
          ],
          "word": "Duellpistole"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "type of pistol used in duels",
          "tags": [
            "common-gender"
          ],
          "word": "duellpistol"
        }
      ]
    }
  ],
  "word": "duelling pistol"
}

{
  "forms": [
    {
      "form": "duelling pistols",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "duelling pistol (plural duelling pistols)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
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        "en:Firearms"
      ],
      "glosses": [
        "a type of pistol that was manufactured in matching pairs to be used in a duel"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "dueling pistol"
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "type of pistol used in duels",
      "tags": [
        "feminine"
      ],
      "word": "Duellpistole"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "type of pistol used in duels",
      "tags": [
        "common-gender"
      ],
      "word": "duellpistol"
    }
  ],
  "word": "duelling pistol"
}