"backstone" meaning in English

{
  "etymology_number": 1,
  "forms": [
    {
      "form": "backstones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "backstone (plural backstones)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "bakestone"
        }
      ],
      "categories": [
        {
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      ],
      "glosses": [
        "Alternative form of bakestone."
      ],
      "id": "en-backstone-en-noun-CR8aa65-",
      "links": [
        [
          "bakestone",
          "bakestone#English"
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      ],
      "tags": [
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  ],
  "word": "backstone"
}

{
  "etymology_number": 2,
  "forms": [
    {
      "form": "backstones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "backstone (plural backstones)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "bold_text_offsets": [
            [
              8,
              18
            ]
          ],
          "ref": "2000, Aubrey Burl, The Stone Circles of Britain, Ireland, and Brittany, page 225:",
          "text": "[…] the backstones of the burial-chambers were a deep red.",
          "type": "quotation"
        },
        {
          "bold_text_offsets": [
            [
              0,
              10
            ]
          ],
          "ref": "2008, Tatjana Kytmannow, Portal Tombs in the Landscape, page 39:",
          "text": "Backstones in an intact tomb normally function to support the capstone and to define the rear end of the chamber.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A stone at the rear of something."
      ],
      "id": "en-backstone-en-noun-ZQ9YlqZX"
    }
  ],
  "word": "backstone"
}

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  "etymology_number": 1,
  "forms": [
    {
      "form": "backstones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "backstone (plural backstones)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "bakestone"
        }
      ],
      "glosses": [
        "Alternative form of bakestone."
      ],
      "links": [
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          "bakestone",
          "bakestone#English"
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      ],
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  ],
  "word": "backstone"
}

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  "categories": [
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    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
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  "etymology_number": 2,
  "forms": [
    {
      "form": "backstones",
      "tags": [
        "plural"
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    }
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      "expansion": "backstone (plural backstones)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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      "examples": [
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          "ref": "2000, Aubrey Burl, The Stone Circles of Britain, Ireland, and Brittany, page 225:",
          "text": "[…] the backstones of the burial-chambers were a deep red.",
          "type": "quotation"
        },
        {
          "bold_text_offsets": [
            [
              0,
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          ],
          "ref": "2008, Tatjana Kytmannow, Portal Tombs in the Landscape, page 39:",
          "text": "Backstones in an intact tomb normally function to support the capstone and to define the rear end of the chamber.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A stone at the rear of something."
      ]
    }
  ],
  "word": "backstone"
}