"supergrade" meaning in English

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  "etymology_text": "From super- + grade.",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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          "name": "Isotopes",
          "orig": "en:Isotopes",
          "parents": [],
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        },
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          "name": "Nuclear energy",
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          "langcode": "en",
          "name": "Nuclear warfare",
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          "langcode": "en",
          "name": "Radioactivity",
          "orig": "en:Radioactivity",
          "parents": [],
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      ],
      "coordinate_terms": [
        {
          "word": "reactor grade"
        },
        {
          "word": "fuel grade"
        },
        {
          "word": "weapons-grade"
        }
      ],
      "glosses": [
        "Of plutonium: containing a very small portion of isotopes other than plutonium-239 (especially plutonium-240) (less than perhaps 3%), making the plutonium especially suitable for nuclear weapons"
      ],
      "id": "en-supergrade-en-adj-KRWVfPHF",
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          "plutonium",
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        "not-comparable"
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        "supergrade"
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  "word": "supergrade"
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{
  "coordinate_terms": [
    {
      "word": "reactor grade"
    },
    {
      "word": "fuel grade"
    },
    {
      "word": "weapons-grade"
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  "etymology_text": "From super- + grade.",
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  "lang_code": "en",
  "pos": "adj",
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        "en:Isotopes",
        "en:Nuclear energy",
        "en:Nuclear warfare",
        "en:Radioactivity"
      ],
      "glosses": [
        "Of plutonium: containing a very small portion of isotopes other than plutonium-239 (especially plutonium-240) (less than perhaps 3%), making the plutonium especially suitable for nuclear weapons"
      ],
      "links": [
        [
          "plutonium",
          "plutonium"
        ],
        [
          "nuclear weapons",
          "nuclear weapons"
        ]
      ],
      "tags": [
        "not-comparable"
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        "supergrade"
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  "word": "supergrade"
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