"crabstone" meaning in English

{
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        "2": "crab",
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      "expansion": "crab + stone",
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  ],
  "etymology_text": "From crab + stone.",
  "forms": [
    {
      "form": "crabstones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "crabstone (plural crabstones)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "1999, Mike Mitchell, translating HJC von Grimmelshausen, Simplicissimus, IV.8, Dedalus 2016, p. 303",
          "text": "[F]rom cadmium, gravel, crab-stones [translating Krebsaugen], emery and talc I prepared a powder for whitening teeth, and from lye, copper, sal ammoniac and camphor a blue tincture for scurvy, stomatitis, toothache and sore eyes."
        }
      ],
      "glosses": [
        "A calcareous concretion found in the stomach of crabs and other crustaceans."
      ],
      "id": "en-crabstone-en-noun-eIivLiHT",
      "links": [
        [
          "calcareous",
          "calcareous"
        ],
        [
          "concretion",
          "concretion"
        ],
        [
          "crab",
          "crab"
        ],
        [
          "crustacean",
          "crustacean"
        ]
      ]
    }
  ],
  "word": "crabstone"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "crab",
        "3": "stone"
      },
      "expansion": "crab + stone",
      "name": "compound"
    }
  ],
  "etymology_text": "From crab + stone.",
  "forms": [
    {
      "form": "crabstones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "crabstone (plural crabstones)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "ref": "1999, Mike Mitchell, translating HJC von Grimmelshausen, Simplicissimus, IV.8, Dedalus 2016, p. 303",
          "text": "[F]rom cadmium, gravel, crab-stones [translating Krebsaugen], emery and talc I prepared a powder for whitening teeth, and from lye, copper, sal ammoniac and camphor a blue tincture for scurvy, stomatitis, toothache and sore eyes."
        }
      ],
      "glosses": [
        "A calcareous concretion found in the stomach of crabs and other crustaceans."
      ],
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          "calcareous",
          "calcareous"
        ],
        [
          "concretion",
          "concretion"
        ],
        [
          "crab",
          "crab"
        ],
        [
          "crustacean",
          "crustacean"
        ]
      ]
    }
  ],
  "word": "crabstone"
}