"metallurgical coal" meaning in English

{
  "forms": [
    {
      "form": "metallurgical coals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "metallurgical coal (countable and uncountable, plural metallurgical coals)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Coal",
          "orig": "en:Coal",
          "parents": [
            "Fossil fuels",
            "Carbon",
            "Energy",
            "Natural resources",
            "Carbon group elements",
            "Nature",
            "Matter",
            "Chemical elements",
            "All topics",
            "Chemistry",
            "Fundamental",
            "Sciences"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Steel",
          "orig": "en:Steel",
          "parents": [],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "thermal coal"
        },
        {
          "word": "steaming coal"
        }
      ],
      "glosses": [
        "The type of coal used for the making of steel."
      ],
      "id": "en-metallurgical_coal-en-noun-MREv6uXr",
      "links": [
        [
          "coal",
          "coal"
        ],
        [
          "steel",
          "steel"
        ]
      ],
      "synonyms": [
        {
          "word": "coking coal"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "metallurgical coal"
}

{
  "coordinate_terms": [
    {
      "word": "thermal coal"
    },
    {
      "word": "steaming coal"
    }
  ],
  "forms": [
    {
      "form": "metallurgical coals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "metallurgical coal (countable and uncountable, plural metallurgical coals)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "en:Coal",
        "en:Steel"
      ],
      "glosses": [
        "The type of coal used for the making of steel."
      ],
      "links": [
        [
          "coal",
          "coal"
        ],
        [
          "steel",
          "steel"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "coking coal"
    }
  ],
  "word": "metallurgical coal"
}