"wall tower" meaning in English

{
  "forms": [
    {
      "form": "wall towers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "wall tower (plural wall towers)",
      "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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          "source": "w"
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        },
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          "name": "Terms with Polish translations",
          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Buildings and structures",
          "orig": "en:Buildings and structures",
          "parents": [
            "Architecture",
            "Applied sciences",
            "Art",
            "Sciences",
            "Culture",
            "All topics",
            "Society",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A tower built into and forming part of a line of fortification or a fortified city wall."
      ],
      "id": "en-wall_tower-en-noun-GbNpzvjp",
      "links": [
        [
          "line",
          "line"
        ],
        [
          "fortification",
          "fortification"
        ],
        [
          "city",
          "city"
        ]
      ],
      "translations": [
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "baszta"
        }
      ]
    }
  ],
  "word": "wall tower"
}

{
  "forms": [
    {
      "form": "wall towers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "wall tower (plural wall towers)",
      "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",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Polish translations",
        "Translation table header lacks gloss",
        "en:Buildings and structures"
      ],
      "glosses": [
        "A tower built into and forming part of a line of fortification or a fortified city wall."
      ],
      "links": [
        [
          "line",
          "line"
        ],
        [
          "fortification",
          "fortification"
        ],
        [
          "city",
          "city"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "baszta"
    }
  ],
  "word": "wall tower"
}