"megatooth shark" meaning in English

{
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    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "tooth"
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      "expansion": "mega- + tooth",
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  ],
  "etymology_text": "From mega- + tooth.",
  "forms": [
    {
      "form": "megatooth sharks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "megatooth shark (plural megatooth sharks)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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          "source": "w"
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        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Lamniform sharks",
          "orig": "en:Lamniform sharks",
          "parents": [
            "Sharks",
            "Fish",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
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            "Nature"
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          "source": "w"
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      ],
      "glosses": [
        "Any extinct shark in the family †Otodontidae, especially megalodon."
      ],
      "id": "en-megatooth_shark-en-noun-ssTiwr0z",
      "links": [
        [
          "Otodontidae",
          "Otodontidae"
        ],
        [
          "megalodon",
          "megalodon"
        ]
      ]
    }
  ],
  "word": "megatooth shark"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "tooth"
      },
      "expansion": "mega- + tooth",
      "name": "prefix"
    }
  ],
  "etymology_text": "From mega- + tooth.",
  "forms": [
    {
      "form": "megatooth sharks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "megatooth shark (plural megatooth sharks)",
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  "lang_code": "en",
  "pos": "noun",
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        "Any extinct shark in the family †Otodontidae, especially megalodon."
      ],
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        [
          "Otodontidae",
          "Otodontidae"
        ],
        [
          "megalodon",
          "megalodon"
        ]
      ]
    }
  ],
  "word": "megatooth shark"
}