"chicken shell" meaning in English

{
  "forms": [
    {
      "form": "chicken shells",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chicken shell (plural chicken shells)",
      "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": "lifeform",
          "langcode": "en",
          "name": "Bivalves",
          "orig": "en:Bivalves",
          "parents": [
            "Mollusks",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 274",
          "text": "Port Essington, one of the \"likeliest\" places, proved its reputation, and the fishers raised what is known as the best kind of \"chicken shell\" without any diving appliances whatever.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The shell of young oysters, harvested for pearls and for use in ornamental work."
      ],
      "id": "en-chicken_shell-en-noun-~vagEZc-",
      "links": [
        [
          "oyster",
          "oyster"
        ],
        [
          "harvest",
          "harvest"
        ],
        [
          "pearl",
          "pearl"
        ],
        [
          "ornamental",
          "ornamental"
        ]
      ]
    }
  ],
  "word": "chicken shell"
}

{
  "forms": [
    {
      "form": "chicken shells",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chicken shell (plural chicken shells)",
      "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",
        "en:Bivalves"
      ],
      "examples": [
        {
          "ref": "1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 274",
          "text": "Port Essington, one of the \"likeliest\" places, proved its reputation, and the fishers raised what is known as the best kind of \"chicken shell\" without any diving appliances whatever.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The shell of young oysters, harvested for pearls and for use in ornamental work."
      ],
      "links": [
        [
          "oyster",
          "oyster"
        ],
        [
          "harvest",
          "harvest"
        ],
        [
          "pearl",
          "pearl"
        ],
        [
          "ornamental",
          "ornamental"
        ]
      ]
    }
  ],
  "word": "chicken shell"
}