"acero nero" meaning in Italian

{
  "forms": [
    {
      "form": "aceri neri",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "acero nero m (plural aceri neri)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "it",
          "name": "Maples",
          "orig": "it:Maples",
          "parents": [
            "Soapberry family plants",
            "Trees",
            "Sapindales order plants",
            "Shrubs",
            "Plants",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "it",
          "name": "Trees",
          "orig": "it:Trees",
          "parents": [
            "Plants",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "black maple (tree, Acer nigrum)"
      ],
      "id": "en-acero_nero-it-noun-OGoutrC4",
      "links": [
        [
          "black maple",
          "black maple"
        ]
      ],
      "tags": [
        "masculine"
      ],
      "wikipedia": [
        "it:acero nero"
      ]
    }
  ],
  "word": "acero nero"
}

{
  "forms": [
    {
      "form": "aceri neri",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "acero nero m (plural aceri neri)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Entries using missing taxonomic name (species)",
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian masculine nouns",
        "Italian multiword terms",
        "Italian nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "it:Maples",
        "it:Trees"
      ],
      "glosses": [
        "black maple (tree, Acer nigrum)"
      ],
      "links": [
        [
          "black maple",
          "black maple"
        ]
      ],
      "tags": [
        "masculine"
      ],
      "wikipedia": [
        "it:acero nero"
      ]
    }
  ],
  "word": "acero nero"
}