"pietraio" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "pietra",
        "3": "aio"
      },
      "expansion": "pietra + -aio",
      "name": "suffix"
    }
  ],
  "etymology_text": "From pietra + -aio.",
  "forms": [
    {
      "form": "pietrai",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "pietraio m (plural pietrai)",
      "name": "it-noun"
    }
  ],
  "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"
        },
        {
          "kind": "other",
          "name": "Italian terms suffixed with -aio",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of scalpellino"
      ],
      "id": "en-pietraio-it-noun-v3aJK-N1",
      "links": [
        [
          "scalpellino",
          "scalpellino#Italian"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "scalpellino"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "pietraio"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "pietra",
        "3": "aio"
      },
      "expansion": "pietra + -aio",
      "name": "suffix"
    }
  ],
  "etymology_text": "From pietra + -aio.",
  "forms": [
    {
      "form": "pietrai",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "pietraio m (plural pietrai)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian masculine nouns",
        "Italian nouns",
        "Italian nouns with red links in their headword lines",
        "Italian terms suffixed with -aio",
        "Pages with 1 entry"
      ],
      "glosses": [
        "Synonym of scalpellino"
      ],
      "links": [
        [
          "scalpellino",
          "scalpellino#Italian"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "scalpellino"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "pietraio"
}