"ferro-" meaning in French

{
  "etymology_number": "1",
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "la",
        "3": "ferrum"
      },
      "expansion": "Latin ferrum",
      "name": "uder"
    }
  ],
  "etymology_text": "From Latin ferrum.",
  "head_templates": [
    {
      "args": {},
      "expansion": "ferro-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French undefined derivations",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "ferro-"
      ],
      "id": "en-ferro--fr-prefix-NX-2HZGR",
      "links": [
        [
          "ferro-",
          "ferro-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "ferro-"
}

{
  "etymology_number": "2",
  "etymology_text": "From chemin de fer (literally “iron paths”).",
  "head_templates": [
    {
      "args": {},
      "expansion": "ferro-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "_dis": "0 100",
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Relating to railways"
      ],
      "id": "en-ferro--fr-prefix-CXhhwmIF",
      "links": [
        [
          "railways",
          "railways"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "ferro-"
}

{
  "categories": [
    "French entries with incorrect language header",
    "French lemmas",
    "French prefixes",
    "French terms derived from Latin",
    "French undefined derivations",
    "Pages using catfix",
    "Pages with 6 entries",
    "Pages with entries"
  ],
  "etymology_number": "1",
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "la",
        "3": "ferrum"
      },
      "expansion": "Latin ferrum",
      "name": "uder"
    }
  ],
  "etymology_text": "From Latin ferrum.",
  "head_templates": [
    {
      "args": {},
      "expansion": "ferro-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "ferro-"
      ],
      "links": [
        [
          "ferro-",
          "ferro-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "ferro-"
}

{
  "categories": [
    "French entries with incorrect language header",
    "French lemmas",
    "French prefixes",
    "Pages using catfix",
    "Pages with 6 entries",
    "Pages with entries"
  ],
  "etymology_number": "2",
  "etymology_text": "From chemin de fer (literally “iron paths”).",
  "head_templates": [
    {
      "args": {},
      "expansion": "ferro-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "Relating to railways"
      ],
      "links": [
        [
          "railways",
          "railways"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "ferro-"
}