"bookwheel" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "book",
        "3": "wheel"
      },
      "expansion": "book + wheel",
      "name": "compound"
    }
  ],
  "etymology_text": "book + wheel",
  "forms": [
    {
      "form": "bookwheels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bookwheel (plural bookwheels)",
      "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"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A millwheel-shaped contraption allowing a reader to toggle between different books, all kept upright on separate shelves as the wheel turns."
      ],
      "id": "en-bookwheel-en-noun-8DcATGsJ",
      "raw_glosses": [
        "(historical) A millwheel-shaped contraption allowing a reader to toggle between different books, all kept upright on separate shelves as the wheel turns."
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "bookwheel"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "book",
        "3": "wheel"
      },
      "expansion": "book + wheel",
      "name": "compound"
    }
  ],
  "etymology_text": "book + wheel",
  "forms": [
    {
      "form": "bookwheels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bookwheel (plural bookwheels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with historical senses"
      ],
      "glosses": [
        "A millwheel-shaped contraption allowing a reader to toggle between different books, all kept upright on separate shelves as the wheel turns."
      ],
      "raw_glosses": [
        "(historical) A millwheel-shaped contraption allowing a reader to toggle between different books, all kept upright on separate shelves as the wheel turns."
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "bookwheel"
}