"腔" meaning in Japanese

{
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant manual transliterations",
          "parents": [
            "Terms with non-redundant manual transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Kanji used for names",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "english": "cavity within tubular organ",
          "roman": "naikū",
          "ruby": [
            [
              "内腔",
              "ないくう"
            ]
          ],
          "word": "内腔: lumen"
        }
      ],
      "glosses": [
        "cavity"
      ],
      "id": "en-腔-ja-character-MetctGcA",
      "tags": [
        "Jinmeiyō",
        "kanji"
      ],
      "wikipedia": [
        "Kyūjitai",
        "Shinjitai"
      ]
    }
  ],
  "word": "腔"
}

{
  "derived": [
    {
      "english": "cavity within tubular organ",
      "roman": "naikū",
      "ruby": [
        [
          "内腔",
          "ないくう"
        ]
      ],
      "word": "内腔: lumen"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Japanese Han characters",
        "Japanese kanji with goon reading こう",
        "Japanese kanji with kan'on reading こう",
        "Japanese kanji with kan'yōon reading くう",
        "Japanese kanji with kun reading うつろ",
        "Japanese kanji with kun reading からだ",
        "Japanese kanji with kun readings missing okurigana designation",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese terms spelled with 腔",
        "Japanese terms with non-redundant manual transliterations",
        "Japanese terms with redundant transliterations",
        "Kanji used for names"
      ],
      "glosses": [
        "cavity"
      ],
      "tags": [
        "Jinmeiyō",
        "kanji"
      ],
      "wikipedia": [
        "Kyūjitai",
        "Shinjitai"
      ]
    }
  ],
  "word": "腔"
}