"gamma iron" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Allotropes",
          "orig": "en:Allotropes",
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          "name": "Iron",
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          "name": "Metallurgy",
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      ],
      "coordinate_terms": [
        {
          "word": "alpha iron"
        },
        {
          "word": "beta iron"
        }
      ],
      "glosses": [
        "An allotrope of iron which is stable at high temperatures. It is used in the manufacture of austenite."
      ],
      "id": "en-gamma_iron-en-noun-qnv47o8A",
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          "allotrope",
          "allotrope"
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        [
          "iron",
          "iron"
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        [
          "austenite",
          "austenite"
        ]
      ],
      "raw_glosses": [
        "(metallurgy) An allotrope of iron which is stable at high temperatures. It is used in the manufacture of austenite."
      ],
      "synonyms": [
        {
          "word": "gamma-iron"
        }
      ],
      "tags": [
        "uncountable"
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      "topics": [
        "engineering",
        "metallurgy",
        "natural-sciences",
        "physical-sciences"
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      "wikipedia": [
        "Austenite"
      ]
    }
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  "word": "gamma iron"
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      "word": "alpha iron"
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      "word": "beta iron"
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      "expansion": "gamma iron (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "An allotrope of iron which is stable at high temperatures. It is used in the manufacture of austenite."
      ],
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          "metallurgy",
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          "allotrope",
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          "austenite",
          "austenite"
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      "raw_glosses": [
        "(metallurgy) An allotrope of iron which is stable at high temperatures. It is used in the manufacture of austenite."
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        "uncountable"
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        "engineering",
        "metallurgy",
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      "wikipedia": [
        "Austenite"
      ]
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  ],
  "synonyms": [
    {
      "word": "gamma-iron"
    }
  ],
  "word": "gamma iron"
}