"zerro" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "la",
        "3": "gerris"
      },
      "expansion": "Latin gerris",
      "name": "der"
    }
  ],
  "etymology_text": "Latin gerris",
  "forms": [
    {
      "form": "zerri",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "zerro m (plural zerri)",
      "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": "lifeform",
          "langcode": "it",
          "name": "Fish",
          "orig": "it:Fish",
          "parents": [
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "picarel (Spicara smaris)"
      ],
      "id": "en-zerro-it-noun-~tdCSVRM",
      "links": [
        [
          "picarel",
          "picarel"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "zerro"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "la",
        "3": "gerris"
      },
      "expansion": "Latin gerris",
      "name": "der"
    }
  ],
  "etymology_text": "Latin gerris",
  "forms": [
    {
      "form": "zerri",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "zerro m (plural zerri)",
      "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 nouns",
        "Italian terms derived from Latin",
        "it:Fish"
      ],
      "glosses": [
        "picarel (Spicara smaris)"
      ],
      "links": [
        [
          "picarel",
          "picarel"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "zerro"
}