"Ferro meridian" meaning in English

{
  "etymology_text": "So named because it runs through the island Ferro (El Hierro), considered the end of the known world by the Europeans at the time.",
  "head_templates": [
    {
      "args": {},
      "expansion": "Ferro meridian",
      "name": "en-proper noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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          "kind": "other",
          "name": "English entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geography",
          "orig": "en:Geography",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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      ],
      "glosses": [
        "A meridian formerly used as a prime meridian; now defined as 18.160792° west."
      ],
      "id": "en-Ferro_meridian-en-name-Ulo0jjB1",
      "links": [
        [
          "geography",
          "geography"
        ],
        [
          "meridian",
          "meridian"
        ],
        [
          "prime meridian",
          "prime meridian"
        ]
      ],
      "raw_glosses": [
        "(historical, geography) A meridian formerly used as a prime meridian; now defined as 18.160792° west."
      ],
      "tags": [
        "historical"
      ],
      "topics": [
        "geography",
        "natural-sciences"
      ]
    }
  ],
  "word": "Ferro meridian"
}

{
  "etymology_text": "So named because it runs through the island Ferro (El Hierro), considered the end of the known world by the Europeans at the time.",
  "head_templates": [
    {
      "args": {},
      "expansion": "Ferro meridian",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
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        "Pages with 1 entry",
        "en:Geography"
      ],
      "glosses": [
        "A meridian formerly used as a prime meridian; now defined as 18.160792° west."
      ],
      "links": [
        [
          "geography",
          "geography"
        ],
        [
          "meridian",
          "meridian"
        ],
        [
          "prime meridian",
          "prime meridian"
        ]
      ],
      "raw_glosses": [
        "(historical, geography) A meridian formerly used as a prime meridian; now defined as 18.160792° west."
      ],
      "tags": [
        "historical"
      ],
      "topics": [
        "geography",
        "natural-sciences"
      ]
    }
  ],
  "word": "Ferro meridian"
}