"hålven" meaning in Swedish

{
  "etymology_templates": [
    {
      "args": {
        "1": "sv",
        "2": "hål",
        "3": "ven"
      },
      "expansion": "hål + ven",
      "name": "compound"
    }
  ],
  "etymology_text": "hål + ven",
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "noun"
      },
      "expansion": "hålven",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Swedish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "sv",
          "name": "Anatomy",
          "orig": "sv:Anatomy",
          "parents": [
            "Biology",
            "Medicine",
            "Sciences",
            "Healthcare",
            "All topics",
            "Health",
            "Fundamental",
            "Body"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "vena cava, large vein that returns blood into right atrium"
      ],
      "id": "en-hålven-sv-noun-22NeUNx7",
      "links": [
        [
          "anatomy",
          "anatomy"
        ],
        [
          "vena cava",
          "vena cava"
        ]
      ],
      "raw_glosses": [
        "(anatomy) vena cava, large vein that returns blood into right atrium"
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "hålven"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "sv",
        "2": "hål",
        "3": "ven"
      },
      "expansion": "hål + ven",
      "name": "compound"
    }
  ],
  "etymology_text": "hål + ven",
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "noun"
      },
      "expansion": "hålven",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Swedish compound terms",
        "Swedish entries with incorrect language header",
        "Swedish lemmas",
        "Swedish nouns",
        "sv:Anatomy"
      ],
      "glosses": [
        "vena cava, large vein that returns blood into right atrium"
      ],
      "links": [
        [
          "anatomy",
          "anatomy"
        ],
        [
          "vena cava",
          "vena cava"
        ]
      ],
      "raw_glosses": [
        "(anatomy) vena cava, large vein that returns blood into right atrium"
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "hålven"
}