"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"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
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          "parents": [
            "Entries with language name categories using raw markup",
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          "source": "w"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geography",
          "orig": "en:Geography",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "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": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English terms derived from toponyms",
        "English terms with historical senses",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "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"
}