"ferro-" meaning in Italian

{
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "prefix"
      },
      "expansion": "ferro-",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "ferro-"
      ],
      "id": "en-ferro--it-prefix-NX-2HZGR",
      "links": [
        [
          "ferro-",
          "ferro-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "0 100",
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "forms terms relating to railways/railroads"
      ],
      "id": "en-ferro--it-prefix-DY4D1YkH",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "ferro-"
}

{
  "categories": [
    "Italian entries with incorrect language header",
    "Italian lemmas",
    "Italian prefixes",
    "Pages using catfix",
    "Pages with 6 entries",
    "Pages with entries"
  ],
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "prefix"
      },
      "expansion": "ferro-",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "ferro-"
      ],
      "links": [
        [
          "ferro-",
          "ferro-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "forms terms relating to railways/railroads"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "ferro-"
}