"malacostracology" meaning in English

{
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      "expansion": "malaco- +",
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    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ὄστρακον",
        "4": "",
        "5": "clay pot; shell"
      },
      "expansion": "Ancient Greek ὄστρακον (óstrakon, “clay pot; shell”)",
      "name": "der"
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    {
      "args": {
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        "2": "",
        "3": "logy"
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      "expansion": "+ -logy",
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  ],
  "etymology_text": "malaco- + Ancient Greek ὄστρακον (óstrakon, “clay pot; shell”) + -logy",
  "head_templates": [
    {
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      "expansion": "malacostracology (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "English terms prefixed with malaco-",
          "parents": [],
          "source": "w"
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          "parents": [],
          "source": "w"
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      ],
      "derived": [
        {
          "word": "malacostracologist"
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      ],
      "glosses": [
        "carcinology, the study of crustaceans"
      ],
      "id": "en-malacostracology-en-noun-rH79QOjY",
      "links": [
        [
          "carcinology",
          "carcinology"
        ],
        [
          "crustacean",
          "crustacean"
        ]
      ],
      "raw_glosses": [
        "(obsolete) carcinology, the study of crustaceans"
      ],
      "tags": [
        "obsolete",
        "uncountable"
      ]
    }
  ],
  "word": "malacostracology"
}

{
  "derived": [
    {
      "word": "malacostracologist"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "malaco",
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      "expansion": "malaco- +",
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    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ὄστρακον",
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        "5": "clay pot; shell"
      },
      "expansion": "Ancient Greek ὄστρακον (óstrakon, “clay pot; shell”)",
      "name": "der"
    },
    {
      "args": {
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        "2": "",
        "3": "logy"
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      "expansion": "+ -logy",
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  ],
  "etymology_text": "malaco- + Ancient Greek ὄστρακον (óstrakon, “clay pot; shell”) + -logy",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "malacostracology (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "glosses": [
        "carcinology, the study of crustaceans"
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          "carcinology",
          "carcinology"
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          "crustacean",
          "crustacean"
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        "(obsolete) carcinology, the study of crustaceans"
      ],
      "tags": [
        "obsolete",
        "uncountable"
      ]
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  "word": "malacostracology"
}