"optic disc" meaning in English

{
  "forms": [
    {
      "form": "optic discs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "optic disc (plural optic discs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Anatomy",
          "orig": "en:Anatomy",
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            "Biology",
            "Medicine",
            "Sciences",
            "Healthcare",
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            "Health",
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            "Body"
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          "source": "w"
        }
      ],
      "glosses": [
        "The location where ganglion cell axons exit the eye to form the optic nerve."
      ],
      "id": "en-optic_disc-en-noun-oui0Z7K-",
      "links": [
        [
          "anatomy",
          "anatomy"
        ],
        [
          "ganglion",
          "ganglion"
        ],
        [
          "eye",
          "eye"
        ],
        [
          "optic nerve",
          "optic nerve"
        ]
      ],
      "raw_glosses": [
        "(anatomy) The location where ganglion cell axons exit the eye to form the optic nerve."
      ],
      "related": [
        {
          "word": "blind spot"
        },
        {
          "word": "optical disc"
        }
      ],
      "synonyms": [
        {
          "word": "optic disk"
        }
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ],
      "wikipedia": [
        "optic disc"
      ]
    }
  ],
  "word": "optic disc"
}

{
  "forms": [
    {
      "form": "optic discs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "optic disc (plural optic discs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "blind spot"
    },
    {
      "word": "optical disc"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
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        "en:Anatomy"
      ],
      "glosses": [
        "The location where ganglion cell axons exit the eye to form the optic nerve."
      ],
      "links": [
        [
          "anatomy",
          "anatomy"
        ],
        [
          "ganglion",
          "ganglion"
        ],
        [
          "eye",
          "eye"
        ],
        [
          "optic nerve",
          "optic nerve"
        ]
      ],
      "raw_glosses": [
        "(anatomy) The location where ganglion cell axons exit the eye to form the optic nerve."
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ],
      "wikipedia": [
        "optic disc"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "optic disk"
    }
  ],
  "word": "optic disc"
}