"竜宮城" meaning in Japanese

{
  "forms": [
    {
      "form": "竜宮城",
      "ruby": [
        [
          "竜",
          "りゅう"
        ],
        [
          "宮",
          "ぐう"
        ],
        [
          "城",
          "じょう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ryūgūjō",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "龍宮城",
      "tags": [
        "alternative",
        "kanji",
        "kyūjitai"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "りゅうぐうじょう"
      },
      "expansion": "竜(りゅう)宮(ぐう)城(じょう) • (ryūgūjō)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms read with on'yomi",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 3 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "ja",
          "name": "Japanese mythology",
          "orig": "ja:Japanese mythology",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "ja",
          "name": "Mythology",
          "orig": "ja:Mythology",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "palace of the Dragon King"
      ],
      "id": "en-竜宮城-ja-noun-TPtFi36w",
      "links": [
        [
          "mythology",
          "mythology"
        ],
        [
          "palace",
          "palace"
        ]
      ],
      "raw_glosses": [
        "(mythology) palace of the Dragon King"
      ],
      "synonyms": [
        {
          "word": "竜宮"
        }
      ],
      "topics": [
        "human-sciences",
        "mysticism",
        "mythology",
        "philosophy",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɾʲɨːɡɯ̟ːʑo̞ː]"
    }
  ],
  "word": "竜宮城"
}

{
  "forms": [
    {
      "form": "竜宮城",
      "ruby": [
        [
          "竜",
          "りゅう"
        ],
        [
          "宮",
          "ぐう"
        ],
        [
          "城",
          "じょう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ryūgūjō",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "龍宮城",
      "tags": [
        "alternative",
        "kanji",
        "kyūjitai"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "りゅうぐうじょう"
      },
      "expansion": "竜(りゅう)宮(ぐう)城(じょう) • (ryūgūjō)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms read with on'yomi",
        "Japanese terms spelled with fourth grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms spelled with 城 read as じょう",
        "Japanese terms spelled with 宮 read as ぐう",
        "Japanese terms spelled with 竜 read as りゅう",
        "Japanese terms with 3 kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with IPA pronunciation missing pitch accent",
        "Japanese terms with non-redundant non-automated sortkeys",
        "Japanese terms with redundant sortkeys",
        "Pages with 1 entry",
        "Pages with entries",
        "ja:Japanese mythology",
        "ja:Mythology"
      ],
      "glosses": [
        "palace of the Dragon King"
      ],
      "links": [
        [
          "mythology",
          "mythology"
        ],
        [
          "palace",
          "palace"
        ]
      ],
      "raw_glosses": [
        "(mythology) palace of the Dragon King"
      ],
      "topics": [
        "human-sciences",
        "mysticism",
        "mythology",
        "philosophy",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɾʲɨːɡɯ̟ːʑo̞ː]"
    }
  ],
  "synonyms": [
    {
      "word": "竜宮"
    }
  ],
  "word": "竜宮城"
}