"palpebral fissure" meaning in English

{
  "forms": [
    {
      "form": "palpebral fissures",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "palpebral fissure (plural palpebral fissures)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Anatomy",
          "orig": "en:Anatomy",
          "parents": [
            "Biology",
            "Medicine",
            "Sciences",
            "Healthcare",
            "All topics",
            "Health",
            "Fundamental",
            "Body"
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        }
      ],
      "glosses": [
        "The separation between the upper and lower eyelids."
      ],
      "id": "en-palpebral_fissure-en-noun-XCvUoOO1",
      "links": [
        [
          "anatomy",
          "anatomy"
        ],
        [
          "separation",
          "separation"
        ],
        [
          "eyelid",
          "eyelid"
        ]
      ],
      "raw_glosses": [
        "(anatomy) The separation between the upper and lower eyelids."
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "separation of the eyelids",
          "word": "瞼裂"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "jiǎn liè",
          "sense": "separation of the eyelids",
          "word": "睑裂"
        }
      ]
    }
  ],
  "word": "palpebral fissure"
}

{
  "forms": [
    {
      "form": "palpebral fissures",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "palpebral fissure (plural palpebral fissures)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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    {
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        "English countable nouns",
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        "en:Anatomy"
      ],
      "glosses": [
        "The separation between the upper and lower eyelids."
      ],
      "links": [
        [
          "anatomy",
          "anatomy"
        ],
        [
          "separation",
          "separation"
        ],
        [
          "eyelid",
          "eyelid"
        ]
      ],
      "raw_glosses": [
        "(anatomy) The separation between the upper and lower eyelids."
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "separation of the eyelids",
      "word": "瞼裂"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "jiǎn liè",
      "sense": "separation of the eyelids",
      "word": "睑裂"
    }
  ],
  "word": "palpebral fissure"
}