"procarcinogen" meaning in English

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      "expansion": "From pro- + carcinogen.",
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  "etymology_text": "From pro- + carcinogen.",
  "forms": [
    {
      "form": "procarcinogens",
      "tags": [
        "plural"
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      "expansion": "procarcinogen (plural procarcinogens)",
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "Any substance that is transformed into a carcinogen by metabolism."
      ],
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          "carcinogen",
          "carcinogen"
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        [
          "metabolism",
          "metabolism"
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  "word": "procarcinogen"
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      "expansion": "From pro- + carcinogen.",
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  ],
  "etymology_text": "From pro- + carcinogen.",
  "forms": [
    {
      "form": "procarcinogens",
      "tags": [
        "plural"
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      "expansion": "procarcinogen (plural procarcinogens)",
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  "lang_code": "en",
  "pos": "noun",
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        "Any substance that is transformed into a carcinogen by metabolism."
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          "metabolism"
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  "word": "procarcinogen"
}