"Nitro Express" meaning in English

{
  "etymology_text": "From the cordite propellant used, which is composed of nitrocellulose and nitroglycerine, and express, due to the higher velocities available with cordite compared to black powder.",
  "head_templates": [
    {
      "args": {
        "1": "?",
        "head": "Nitro Express"
      },
      "expansion": "Nitro Express",
      "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",
            "Entry maintenance"
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          "source": "w"
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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"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A large-calibre cartridge with adequate ballistics to kill big game."
      ],
      "id": "en-Nitro_Express-en-noun-TlExTse0",
      "links": [
        [
          "large",
          "large"
        ],
        [
          "calibre",
          "calibre"
        ],
        [
          "cartridge",
          "cartridge"
        ],
        [
          "adequate",
          "adequate"
        ],
        [
          "ballistics",
          "ballistics"
        ],
        [
          "kill",
          "kill"
        ],
        [
          "big game",
          "big game"
        ]
      ],
      "related": [
        {
          "word": "elephant gun"
        }
      ],
      "wikipedia": [
        "Nitro Express"
      ]
    }
  ],
  "word": "Nitro Express"
}

{
  "etymology_text": "From the cordite propellant used, which is composed of nitrocellulose and nitroglycerine, and express, due to the higher velocities available with cordite compared to black powder.",
  "head_templates": [
    {
      "args": {
        "1": "?",
        "head": "Nitro Express"
      },
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "elephant gun"
    }
  ],
  "senses": [
    {
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        "Pages with entries",
        "en:Firearms"
      ],
      "glosses": [
        "A large-calibre cartridge with adequate ballistics to kill big game."
      ],
      "links": [
        [
          "large",
          "large"
        ],
        [
          "calibre",
          "calibre"
        ],
        [
          "cartridge",
          "cartridge"
        ],
        [
          "adequate",
          "adequate"
        ],
        [
          "ballistics",
          "ballistics"
        ],
        [
          "kill",
          "kill"
        ],
        [
          "big game",
          "big game"
        ]
      ],
      "wikipedia": [
        "Nitro Express"
      ]
    }
  ],
  "word": "Nitro Express"
}