"rust joint" meaning in English

{
  "forms": [
    {
      "form": "rust joints",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rust joint (plural rust joints)",
      "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"
        },
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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
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      ],
      "glosses": [
        "A joint made between surfaces of iron by filling the space between them with a wet mixture of cast-iron borings, sal ammoniac, and sulfur, which by oxidation becomes hard and impervious to steam, water, etc."
      ],
      "id": "en-rust_joint-en-noun-nQ9dCdXb",
      "links": [
        [
          "sal ammoniac",
          "sal ammoniac"
        ],
        [
          "sulfur",
          "sulfur"
        ],
        [
          "oxidation",
          "oxidation"
        ]
      ]
    }
  ],
  "word": "rust joint"
}

{
  "forms": [
    {
      "form": "rust joints",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rust joint (plural rust joints)",
      "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",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A joint made between surfaces of iron by filling the space between them with a wet mixture of cast-iron borings, sal ammoniac, and sulfur, which by oxidation becomes hard and impervious to steam, water, etc."
      ],
      "links": [
        [
          "sal ammoniac",
          "sal ammoniac"
        ],
        [
          "sulfur",
          "sulfur"
        ],
        [
          "oxidation",
          "oxidation"
        ]
      ]
    }
  ],
  "word": "rust joint"
}