"downcomer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "down",
        "3": "comer"
      },
      "expansion": "down + comer",
      "name": "compound"
    }
  ],
  "etymology_text": "From down + comer.",
  "forms": [
    {
      "form": "downcomers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "downcomer (plural downcomers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "65 35",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "_dis": "69 31",
          "kind": "other",
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          "_dis": "70 30",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A pipe to conduct something downwards.",
        "A large external pipe in a water-tube boiler, carrying unheated water from the steam drum down to the water drum as part of the circulation path."
      ],
      "id": "en-downcomer-en-noun-Hs7Ot3uz",
      "links": [
        [
          "pipe",
          "pipe"
        ],
        [
          "conduct",
          "conduct"
        ],
        [
          "downwards",
          "downwards"
        ],
        [
          "external",
          "external"
        ],
        [
          "boiler",
          "boiler"
        ],
        [
          "circulation",
          "circulation"
        ],
        [
          "path",
          "path"
        ]
      ]
    },
    {
      "glosses": [
        "A pipe to conduct something downwards.",
        "A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc."
      ],
      "id": "en-downcomer-en-noun-5qxDhSH6",
      "links": [
        [
          "pipe",
          "pipe"
        ],
        [
          "conduct",
          "conduct"
        ],
        [
          "downwards",
          "downwards"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "blast furnace",
          "blast furnace"
        ],
        [
          "regenerator",
          "regenerator"
        ]
      ]
    }
  ],
  "word": "downcomer"
}

{
  "categories": [
    "English compound terms",
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "down",
        "3": "comer"
      },
      "expansion": "down + comer",
      "name": "compound"
    }
  ],
  "etymology_text": "From down + comer.",
  "forms": [
    {
      "form": "downcomers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "downcomer (plural downcomers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A pipe to conduct something downwards.",
        "A large external pipe in a water-tube boiler, carrying unheated water from the steam drum down to the water drum as part of the circulation path."
      ],
      "links": [
        [
          "pipe",
          "pipe"
        ],
        [
          "conduct",
          "conduct"
        ],
        [
          "downwards",
          "downwards"
        ],
        [
          "external",
          "external"
        ],
        [
          "boiler",
          "boiler"
        ],
        [
          "circulation",
          "circulation"
        ],
        [
          "path",
          "path"
        ]
      ]
    },
    {
      "glosses": [
        "A pipe to conduct something downwards.",
        "A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc."
      ],
      "links": [
        [
          "pipe",
          "pipe"
        ],
        [
          "conduct",
          "conduct"
        ],
        [
          "downwards",
          "downwards"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "blast furnace",
          "blast furnace"
        ],
        [
          "regenerator",
          "regenerator"
        ]
      ]
    }
  ],
  "word": "downcomer"
}