"gray iron" meaning in English

{
  "forms": [
    {
      "form": "gray irons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "gray iron (countable and uncountable, plural gray irons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "parents": [
            "Entries with topic categories using raw markup",
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Alloys",
          "orig": "en:Alloys",
          "parents": [
            "Metals",
            "Matter",
            "Metallurgy",
            "Chemistry",
            "Nature",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Iron",
          "orig": "en:Iron",
          "parents": [
            "Transition metals",
            "Chemical elements",
            "Metals",
            "Matter",
            "Metallurgy",
            "Chemistry",
            "Nature",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An alloy of iron, carbon, and silicon that contains 1.7 to 4.5% carbon and 1 to 3% silicon."
      ],
      "id": "en-gray_iron-en-noun-Lo-YJMCm",
      "links": [
        [
          "alloy",
          "alloy"
        ],
        [
          "iron",
          "iron"
        ],
        [
          "carbon",
          "carbon"
        ],
        [
          "silicon",
          "silicon"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "translations": [
        {
          "code": "cs",
          "lang": "Czech",
          "sense": "an alloy of iron, carbon, and silicon",
          "tags": [
            "feminine"
          ],
          "word": "šedá litina"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "séryj čugún",
          "sense": "an alloy of iron, carbon, and silicon",
          "tags": [
            "masculine"
          ],
          "word": "се́рый чугу́н"
        }
      ],
      "wikipedia": [
        "gray iron"
      ]
    }
  ],
  "word": "gray iron"
}

{
  "forms": [
    {
      "form": "gray irons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "gray iron (countable and uncountable, plural gray irons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English countable nouns",
        "English entries with incorrect language header",
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        "English lemmas",
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        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Alloys",
        "en:Iron"
      ],
      "glosses": [
        "An alloy of iron, carbon, and silicon that contains 1.7 to 4.5% carbon and 1 to 3% silicon."
      ],
      "links": [
        [
          "alloy",
          "alloy"
        ],
        [
          "iron",
          "iron"
        ],
        [
          "carbon",
          "carbon"
        ],
        [
          "silicon",
          "silicon"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "wikipedia": [
        "gray iron"
      ]
    }
  ],
  "translations": [
    {
      "code": "cs",
      "lang": "Czech",
      "sense": "an alloy of iron, carbon, and silicon",
      "tags": [
        "feminine"
      ],
      "word": "šedá litina"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "séryj čugún",
      "sense": "an alloy of iron, carbon, and silicon",
      "tags": [
        "masculine"
      ],
      "word": "се́рый чугу́н"
    }
  ],
  "word": "gray iron"
}