"peritonæum" meaning in English

{
  "forms": [
    {
      "form": "peritonæa",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "peritonæa"
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      "expansion": "peritonæum (plural peritonæa)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "peritonaeum"
        }
      ],
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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      "examples": [
        {
          "ref": "1856, Jones Quain, Elements of Anatomy, Walton and Maberly, sixth edition, Volume III., page 336:",
          "text": "This surface of the bladder may be punctured above the pubes without wounding the peritonæum.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Dated form of peritonaeum."
      ],
      "id": "en-peritonæum-en-noun-phNoCL4y",
      "links": [
        [
          "peritonaeum",
          "peritonaeum#English"
        ]
      ],
      "tags": [
        "alt-of",
        "dated"
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    }
  ],
  "word": "peritonæum"
}

{
  "forms": [
    {
      "form": "peritonæa",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "peritonæa"
      },
      "expansion": "peritonæum (plural peritonæa)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "peritonaeum"
        }
      ],
      "categories": [
        "English countable nouns",
        "English dated forms",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English terms spelled with Æ",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
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      "examples": [
        {
          "ref": "1856, Jones Quain, Elements of Anatomy, Walton and Maberly, sixth edition, Volume III., page 336:",
          "text": "This surface of the bladder may be punctured above the pubes without wounding the peritonæum.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Dated form of peritonaeum."
      ],
      "links": [
        [
          "peritonaeum",
          "peritonaeum#English"
        ]
      ],
      "tags": [
        "alt-of",
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  ],
  "word": "peritonæum"
}