"iron scale" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "iron scale (uncountable)",
      "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": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Iron",
          "orig": "en:Iron",
          "parents": [
            "Transition metals",
            "Chemical elements",
            "Metals",
            "Matter",
            "Metallurgy",
            "Chemistry",
            "Nature",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The thin film that forms on the surface of wrought iron in the process of forging. It consists essentially of the magnetic oxide of iron."
      ],
      "id": "en-iron_scale-en-noun-RPiUZwAw",
      "links": [
        [
          "film",
          "film"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "wrought iron",
          "wrought iron"
        ],
        [
          "forging",
          "forge"
        ],
        [
          "magnetic",
          "magnetic"
        ],
        [
          "oxide",
          "oxide"
        ],
        [
          "iron",
          "iron"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "iron scale"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "iron scale (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Iron"
      ],
      "glosses": [
        "The thin film that forms on the surface of wrought iron in the process of forging. It consists essentially of the magnetic oxide of iron."
      ],
      "links": [
        [
          "film",
          "film"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "wrought iron",
          "wrought iron"
        ],
        [
          "forging",
          "forge"
        ],
        [
          "magnetic",
          "magnetic"
        ],
        [
          "oxide",
          "oxide"
        ],
        [
          "iron",
          "iron"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "iron scale"
}