"folding-bone" meaning in English

{
  "forms": [
    {
      "form": "folding-bones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "folding-bone (plural folding-bones)",
      "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"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1996, Heinz Götze, translated by Mary Schäfer, Springer-Verlag: History of a Scientific Publishing House, volume 2, Springer, page 233:",
          "text": "On the opposite side of the spacious hall, however, sat approximately a dozen Indians with their legs crossed, busily folding the printed sheets that had been delivered with the folding-bone, by hand.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Synonym of bone folder"
      ],
      "id": "en-folding-bone-en-noun-zH2aAeNJ",
      "links": [
        [
          "bone folder",
          "bone folder#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "bone folder"
        }
      ]
    }
  ],
  "word": "folding-bone"
}

{
  "forms": [
    {
      "form": "folding-bones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "folding-bone (plural folding-bones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1996, Heinz Götze, translated by Mary Schäfer, Springer-Verlag: History of a Scientific Publishing House, volume 2, Springer, page 233:",
          "text": "On the opposite side of the spacious hall, however, sat approximately a dozen Indians with their legs crossed, busily folding the printed sheets that had been delivered with the folding-bone, by hand.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Synonym of bone folder"
      ],
      "links": [
        [
          "bone folder",
          "bone folder#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "bone folder"
        }
      ]
    }
  ],
  "word": "folding-bone"
}