"mad science" meaning in English

{
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        "1": "en",
        "2": "mad scientist"
      },
      "expansion": "Back-formation from mad scientist",
      "name": "bf"
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  ],
  "etymology_text": "Back-formation from mad scientist.",
  "forms": [
    {
      "form": "mad sciences",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "mad science (plural mad sciences)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English back-formations",
          "parents": [],
          "source": "w"
        },
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          "kind": "other",
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          "parents": [
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      ],
      "glosses": [
        "Science as practiced by a mad scientist"
      ],
      "id": "en-mad_science-en-noun-NuGBES9Y",
      "links": [
        [
          "mad scientist",
          "mad scientist"
        ]
      ]
    }
  ],
  "word": "mad science"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mad scientist"
      },
      "expansion": "Back-formation from mad scientist",
      "name": "bf"
    }
  ],
  "etymology_text": "Back-formation from mad scientist.",
  "forms": [
    {
      "form": "mad sciences",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mad science (plural mad sciences)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English back-formations",
        "English countable nouns",
        "English entries with incorrect language header",
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        "English multiword terms",
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        "Pages with entries"
      ],
      "glosses": [
        "Science as practiced by a mad scientist"
      ],
      "links": [
        [
          "mad scientist",
          "mad scientist"
        ]
      ]
    }
  ],
  "word": "mad science"
}