"pen shell" meaning in English

{
  "forms": [
    {
      "form": "pen shells",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "pen shell (plural pen 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": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Bivalves",
          "orig": "en:Bivalves",
          "parents": [
            "Mollusks",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Any of the Pinnidae, a family of large saltwater clams."
      ],
      "id": "en-pen_shell-en-noun-LAK4KKlv",
      "links": [
        [
          "Pinnidae",
          "Pinnidae#Translingual"
        ],
        [
          "saltwater",
          "saltwater"
        ],
        [
          "clam",
          "clam"
        ]
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "jiāngyáo",
          "sense": "clam",
          "word": "江珧"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "clam",
          "word": "silkkisimpukka"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "clam",
          "word": "nacre"
        }
      ]
    }
  ],
  "word": "pen shell"
}

{
  "forms": [
    {
      "form": "pen shells",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "pen shell (plural pen shells)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "Mandarin terms with redundant transliterations",
        "en:Bivalves"
      ],
      "glosses": [
        "Any of the Pinnidae, a family of large saltwater clams."
      ],
      "links": [
        [
          "Pinnidae",
          "Pinnidae#Translingual"
        ],
        [
          "saltwater",
          "saltwater"
        ],
        [
          "clam",
          "clam"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "jiāngyáo",
      "sense": "clam",
      "word": "江珧"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "clam",
      "word": "silkkisimpukka"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "clam",
      "word": "nacre"
    }
  ],
  "word": "pen shell"
}