"pia madre" meaning in Italian

{
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "noun",
        "g": "f"
      },
      "expansion": "pia madre f",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "pia mater"
      ],
      "id": "en-pia_madre-it-noun-QngER2xL",
      "links": [
        [
          "pia mater",
          "pia mater"
        ]
      ],
      "tags": [
        "feminine"
      ],
      "wikipedia": [
        "it:pia madre"
      ]
    }
  ],
  "word": "pia madre"
}

{
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "noun",
        "g": "f"
      },
      "expansion": "pia madre f",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Italian entries with incorrect language header",
        "Italian feminine nouns",
        "Italian lemmas",
        "Italian multiword terms",
        "Italian nouns"
      ],
      "glosses": [
        "pia mater"
      ],
      "links": [
        [
          "pia mater",
          "pia mater"
        ]
      ],
      "tags": [
        "feminine"
      ],
      "wikipedia": [
        "it:pia madre"
      ]
    }
  ],
  "word": "pia madre"
}