"sail vault" meaning in English

{
  "forms": [
    {
      "form": "sail vaults",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sail vault (plural sail vaults)",
      "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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          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Architecture",
          "orig": "en:Architecture",
          "parents": [
            "Applied sciences",
            "Art",
            "Sciences",
            "Culture",
            "All topics",
            "Society",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A dome-shaped vault constrained to the square inscribed in the base circle."
      ],
      "id": "en-sail_vault-en-noun-8df53fBl",
      "links": [
        [
          "architecture",
          "architecture"
        ],
        [
          "dome",
          "dome"
        ],
        [
          "vault",
          "vault"
        ],
        [
          "square",
          "square"
        ]
      ],
      "raw_glosses": [
        "(architecture) A dome-shaped vault constrained to the square inscribed in the base circle."
      ],
      "related": [
        {
          "word": "pendentive"
        }
      ],
      "topics": [
        "architecture"
      ],
      "translations": [
        {
          "code": "it",
          "lang": "Italian",
          "sense": "type of vault",
          "word": "volta a vela"
        }
      ]
    }
  ],
  "word": "sail vault"
}

{
  "forms": [
    {
      "form": "sail vaults",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sail vault (plural sail vaults)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "pendentive"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "Terms with Italian translations",
        "en:Architecture"
      ],
      "glosses": [
        "A dome-shaped vault constrained to the square inscribed in the base circle."
      ],
      "links": [
        [
          "architecture",
          "architecture"
        ],
        [
          "dome",
          "dome"
        ],
        [
          "vault",
          "vault"
        ],
        [
          "square",
          "square"
        ]
      ],
      "raw_glosses": [
        "(architecture) A dome-shaped vault constrained to the square inscribed in the base circle."
      ],
      "topics": [
        "architecture"
      ]
    }
  ],
  "translations": [
    {
      "code": "it",
      "lang": "Italian",
      "sense": "type of vault",
      "word": "volta a vela"
    }
  ],
  "word": "sail vault"
}