"castagnaccio" meaning in Italian

{
  "forms": [
    {
      "form": "castagnacci",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "castagnaccio m (plural castagnacci)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "it",
          "name": "Cakes and pastries",
          "orig": "it:Cakes and pastries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Italian chestnut flour cake"
      ],
      "id": "en-castagnaccio-it-noun-D2B8ZinQ",
      "links": [
        [
          "chestnut",
          "chestnut"
        ],
        [
          "flour",
          "flour"
        ],
        [
          "cake",
          "cake"
        ]
      ],
      "related": [
        {
          "word": "castagna"
        }
      ],
      "synonyms": [
        {
          "word": "pattona"
        },
        {
          "word": "migliaccio"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kas.taɲˈɲat.t͡ʃo/"
    }
  ],
  "word": "castagnaccio"
}

{
  "forms": [
    {
      "form": "castagnacci",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "castagnaccio m (plural castagnacci)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "related": [
    {
      "word": "castagna"
    }
  ],
  "senses": [
    {
      "categories": [
        "Italian 4-syllable words",
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian masculine nouns",
        "Italian nouns",
        "Italian terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries",
        "it:Cakes and pastries"
      ],
      "glosses": [
        "Italian chestnut flour cake"
      ],
      "links": [
        [
          "chestnut",
          "chestnut"
        ],
        [
          "flour",
          "flour"
        ],
        [
          "cake",
          "cake"
        ]
      ],
      "synonyms": [
        {
          "word": "pattona"
        },
        {
          "word": "migliaccio"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kas.taɲˈɲat.t͡ʃo/"
    }
  ],
  "word": "castagnaccio"
}