"ferro-" meaning in Spanish

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": ":lbor",
        "3": "la:ferrum"
      },
      "expansion": "[Appendix:Glossary#learned_borrowing|Learned borrowing]] from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"alt\" : \"*fersom\", \"lang_name\" : \"Old Latin\", \"status\" : \"inline\", \"children\" : [ { \"keyword_abbrev\" : \"bor.\", \"keyword_label\" : \"Borrowed from\", \"terms\" : [ { \"lang_name\" : \"substrate\", \"status\" : \"ok\", \"children\" : [ ], \"lang\" : \"qfa-sub\" } ], \"keyword\" : \"bor\" } ], \"lang\" : \"itc-ola\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Latin\", \"term\" : \"ferrum\", \"status\" : \"ok\", \"lang\" : \"la\" } ], \"keyword\" : \"lbor\" } ], \"lang_name\" : \"Spanish\", \"term\" : \"ferro-\", \"status\" : \"ok\", \"lang\" : \"es\" }\" data-lang=\"es\" data-title=\"ferro-\">",
      "name": "etymon"
    },
    {
      "args": {
        "1": "es",
        "2": "la",
        "3": "ferrum",
        "4": "",
        "5": "iron"
      },
      "expansion": "Learned borrowing from Latin ferrum (“iron”)",
      "name": "lbor"
    }
  ],
  "etymology_text": "Learned borrowing from Latin ferrum (“iron”).",
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    {
      "args": {
        "1": "es",
        "2": "prefix"
      },
      "expansion": "ferro-",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using etymon with no ID",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 6 entries",
          "parents": [],
          "source": "w"
        },
        {
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        },
        {
          "kind": "other",
          "name": "Spanish entries with etymon",
          "parents": [],
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        },
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          "kind": "other",
          "name": "Spanish entries with incorrect language header",
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          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "iron",
          "word": "hierro"
        }
      ],
      "glosses": [
        "combining form of hierro (“iron”)"
      ],
      "id": "en-ferro--es-prefix-DEC~~E0P",
      "links": [
        [
          "hierro",
          "hierro#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "in-compounds",
        "morpheme"
      ]
    }
  ],
  "word": "ferro-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": ":lbor",
        "3": "la:ferrum"
      },
      "expansion": "[Appendix:Glossary#learned_borrowing|Learned borrowing]] from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"alt\" : \"*fersom\", \"lang_name\" : \"Old Latin\", \"status\" : \"inline\", \"children\" : [ { \"keyword_abbrev\" : \"bor.\", \"keyword_label\" : \"Borrowed from\", \"terms\" : [ { \"lang_name\" : \"substrate\", \"status\" : \"ok\", \"children\" : [ ], \"lang\" : \"qfa-sub\" } ], \"keyword\" : \"bor\" } ], \"lang\" : \"itc-ola\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Latin\", \"term\" : \"ferrum\", \"status\" : \"ok\", \"lang\" : \"la\" } ], \"keyword\" : \"lbor\" } ], \"lang_name\" : \"Spanish\", \"term\" : \"ferro-\", \"status\" : \"ok\", \"lang\" : \"es\" }\" data-lang=\"es\" data-title=\"ferro-\">",
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    },
    {
      "args": {
        "1": "es",
        "2": "la",
        "3": "ferrum",
        "4": "",
        "5": "iron"
      },
      "expansion": "Learned borrowing from Latin ferrum (“iron”)",
      "name": "lbor"
    }
  ],
  "etymology_text": "Learned borrowing from Latin ferrum (“iron”).",
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    {
      "args": {
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      "expansion": "ferro-",
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  "lang": "Spanish",
  "lang_code": "es",
  "pos": "prefix",
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        "Pages using etymon with no ID",
        "Pages with 6 entries",
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        "Spanish learned borrowings from Latin",
        "Spanish lemmas",
        "Spanish prefixes",
        "Spanish terms borrowed from Latin",
        "Spanish terms derived from Latin",
        "Spanish terms derived from Old Latin",
        "Spanish terms derived from substrate languages"
      ],
      "form_of": [
        {
          "extra": "iron",
          "word": "hierro"
        }
      ],
      "glosses": [
        "combining form of hierro (“iron”)"
      ],
      "links": [
        [
          "hierro",
          "hierro#Spanish"
        ]
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  ],
  "word": "ferro-"
}