"gas coal" meaning in English

{
  "forms": [
    {
      "form": "gas coals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "gas coal (countable and uncountable, plural gas 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"
        }
      ],
      "examples": [
        {
          "ref": "1870, Rossiter Worthington Raymond, Statistics of Mines and Mining in the States and Territories West of the Rocky Mountains",
          "text": "It is a good gas-coal, and well fitted for steam purposes, and for use in reverberatory furnaces.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A bituminous or hydrogenous coal yielding a high proportion of volatile material, and therefore available for the manufacture of illuminating gas."
      ],
      "id": "en-gas_coal-en-noun-LukYxeTS",
      "links": [
        [
          "bituminous",
          "bituminous"
        ],
        [
          "hydrogenous",
          "hydrogenous"
        ],
        [
          "coal",
          "coal"
        ],
        [
          "proportion",
          "proportion"
        ],
        [
          "volatile",
          "volatile"
        ],
        [
          "manufacture",
          "manufacture"
        ],
        [
          "illuminating gas",
          "illuminating gas"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "gas coal"
}

{
  "forms": [
    {
      "form": "gas coals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "gas coal (countable and uncountable, plural gas 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 terms with quotations",
        "English uncountable nouns",
        "en:Coal"
      ],
      "examples": [
        {
          "ref": "1870, Rossiter Worthington Raymond, Statistics of Mines and Mining in the States and Territories West of the Rocky Mountains",
          "text": "It is a good gas-coal, and well fitted for steam purposes, and for use in reverberatory furnaces.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A bituminous or hydrogenous coal yielding a high proportion of volatile material, and therefore available for the manufacture of illuminating gas."
      ],
      "links": [
        [
          "bituminous",
          "bituminous"
        ],
        [
          "hydrogenous",
          "hydrogenous"
        ],
        [
          "coal",
          "coal"
        ],
        [
          "proportion",
          "proportion"
        ],
        [
          "volatile",
          "volatile"
        ],
        [
          "manufacture",
          "manufacture"
        ],
        [
          "illuminating gas",
          "illuminating gas"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "gas coal"
}