"ur-continent" meaning in English

{
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        "2": "de",
        "3": "Urkontinent"
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      "expansion": "German Urkontinent",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "ur",
        "3": "continent"
      },
      "expansion": "ur- + continent",
      "name": "prefix"
    }
  ],
  "etymology_text": "Borrowed from German Urkontinent, coined by Alfred Wegener, equivalent to ur- + continent.",
  "forms": [
    {
      "form": "ur-continents",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "Ur continent",
      "tags": [
        "alternative"
      ]
    }
  ],
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      "expansion": "ur-continent (plural ur-continents)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "99 1",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w+disamb"
        },
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      "examples": [
        {
          "text": "Coordinate term: ur-ocean"
        },
        {
          "ref": "2012, M. Sears, D. Merriman, Oceanography: The Past:",
          "text": "The second group of convection currents operated in the upper half of the mantle only, split the ur-continent and carried North and South America away from Eurasia, explaining the similarity in the two coastlines—[…]",
          "type": "quote"
        }
      ],
      "glosses": [
        "An original or primordial continent or landmass."
      ],
      "id": "en-ur-continent-en-noun-JtODTLn0",
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        [
          "continent",
          "continent"
        ],
        [
          "landmass",
          "landmass"
        ]
      ],
      "synonyms": [
        {
          "word": "paleocontinent"
        }
      ]
    },
    {
      "glosses": [
        "Pangaea"
      ],
      "id": "en-ur-continent-en-noun-WP54qr1x",
      "links": [
        [
          "Pangaea",
          "Pangaea"
        ]
      ]
    }
  ],
  "word": "ur-continent"
}

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    "English terms prefixed with ur-",
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      "args": {
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        "2": "ur",
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      },
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  ],
  "etymology_text": "Borrowed from German Urkontinent, coined by Alfred Wegener, equivalent to ur- + continent.",
  "forms": [
    {
      "form": "ur-continents",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "Ur continent",
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        "alternative"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "text": "Coordinate term: ur-ocean"
        },
        {
          "ref": "2012, M. Sears, D. Merriman, Oceanography: The Past:",
          "text": "The second group of convection currents operated in the upper half of the mantle only, split the ur-continent and carried North and South America away from Eurasia, explaining the similarity in the two coastlines—[…]",
          "type": "quote"
        }
      ],
      "glosses": [
        "An original or primordial continent or landmass."
      ],
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      ],
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  "word": "ur-continent"
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