"otter shell" meaning in English

{
  "forms": [
    {
      "form": "otter shells",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "otter shell (plural otter 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"
        },
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          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
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        },
        {
          "kind": "other",
          "name": "Terms with Galician translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Venerida order mollusks",
          "orig": "en:Venerida order mollusks",
          "parents": [
            "Bivalves",
            "Mollusks",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Lutraria lutraria, a large marine bivalve mollusc."
      ],
      "id": "en-otter_shell-en-noun--zPMNope",
      "links": [
        [
          "marine",
          "marine"
        ],
        [
          "bivalve",
          "bivalve"
        ],
        [
          "mollusc",
          "mollusc"
        ]
      ],
      "translations": [
        {
          "code": "gl",
          "lang": "Galician",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "arola"
        }
      ],
      "wikipedia": [
        "otter shell"
      ]
    }
  ],
  "word": "otter shell"
}

{
  "forms": [
    {
      "form": "otter shells",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "otter shell (plural otter shells)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "English multiword terms",
        "English nouns",
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        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Galician translations",
        "Translation table header lacks gloss",
        "en:Venerida order mollusks"
      ],
      "glosses": [
        "Lutraria lutraria, a large marine bivalve mollusc."
      ],
      "links": [
        [
          "marine",
          "marine"
        ],
        [
          "bivalve",
          "bivalve"
        ],
        [
          "mollusc",
          "mollusc"
        ]
      ],
      "wikipedia": [
        "otter shell"
      ]
    }
  ],
  "translations": [
    {
      "code": "gl",
      "lang": "Galician",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "arola"
    }
  ],
  "word": "otter shell"
}