"polygonal fort" meaning in English

{
  "forms": [
    {
      "form": "polygonal forts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "polygonal fort (plural polygonal forts)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A kind of fortification without bastions, and generally arranged in a ring around the protected area, originating in France in the late 18th century and fully developed in Germany in the first half of the 19th century."
      ],
      "id": "en-polygonal_fort-en-noun-FwdEsLtd",
      "links": [
        [
          "fortification",
          "fortification"
        ],
        [
          "bastion",
          "bastion"
        ],
        [
          "ring",
          "ring"
        ],
        [
          "France",
          "France"
        ],
        [
          "Germany",
          "Germany"
        ]
      ],
      "raw_glosses": [
        "(historical) A kind of fortification without bastions, and generally arranged in a ring around the protected area, originating in France in the late 18th century and fully developed in Germany in the first half of the 19th century."
      ],
      "tags": [
        "historical"
      ],
      "wikipedia": [
        "polygonal fort"
      ]
    }
  ],
  "word": "polygonal fort"
}

{
  "forms": [
    {
      "form": "polygonal forts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "polygonal fort (plural polygonal forts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A kind of fortification without bastions, and generally arranged in a ring around the protected area, originating in France in the late 18th century and fully developed in Germany in the first half of the 19th century."
      ],
      "links": [
        [
          "fortification",
          "fortification"
        ],
        [
          "bastion",
          "bastion"
        ],
        [
          "ring",
          "ring"
        ],
        [
          "France",
          "France"
        ],
        [
          "Germany",
          "Germany"
        ]
      ],
      "raw_glosses": [
        "(historical) A kind of fortification without bastions, and generally arranged in a ring around the protected area, originating in France in the late 18th century and fully developed in Germany in the first half of the 19th century."
      ],
      "tags": [
        "historical"
      ],
      "wikipedia": [
        "polygonal fort"
      ]
    }
  ],
  "word": "polygonal fort"
}