"flare stack" meaning in English

{
  "forms": [
    {
      "form": "flare stacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "flare stack (plural flare stacks)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2019, Bernardine Evaristo, Girl, Woman, Other, Penguin Books (2020), page 171:",
          "text": "she imagined them demolishing all the equipment used for oil production, including the flare stacks that rose into the skies to burn the natural gas",
          "type": "quote"
        }
      ],
      "glosses": [
        "a tall structure used for burning off waste gas at oil refineries and other installations."
      ],
      "id": "en-flare_stack-en-noun-Wa-Q~gUd",
      "links": [
        [
          "oil refineries",
          "oil refinery"
        ]
      ],
      "synonyms": [
        {
          "word": "flare tower"
        }
      ]
    }
  ],
  "word": "flare stack"
}

{
  "forms": [
    {
      "form": "flare stacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "flare stack (plural flare stacks)",
      "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",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2019, Bernardine Evaristo, Girl, Woman, Other, Penguin Books (2020), page 171:",
          "text": "she imagined them demolishing all the equipment used for oil production, including the flare stacks that rose into the skies to burn the natural gas",
          "type": "quote"
        }
      ],
      "glosses": [
        "a tall structure used for burning off waste gas at oil refineries and other installations."
      ],
      "links": [
        [
          "oil refineries",
          "oil refinery"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "flare tower"
    }
  ],
  "word": "flare stack"
}