"-metro" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "ine-pro",
        "3": "*meh₁-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "it",
        "2": "grc",
        "3": "μέτρον",
        "4": "",
        "5": "measure"
      },
      "expansion": "Ancient Greek μέτρον (métron, “measure”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek μέτρον (métron, “measure”).",
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "suffix",
        "g": "m"
      },
      "expansion": "-metro m",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "-meter"
      ],
      "id": "en--metro-it-suffix-WtbKnrKp",
      "links": [
        [
          "-meter",
          "-meter"
        ]
      ],
      "tags": [
        "masculine",
        "morpheme"
      ]
    }
  ],
  "word": "-metro"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "ine-pro",
        "3": "*meh₁-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "it",
        "2": "grc",
        "3": "μέτρον",
        "4": "",
        "5": "measure"
      },
      "expansion": "Ancient Greek μέτρον (métron, “measure”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek μέτρον (métron, “measure”).",
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "suffix",
        "g": "m"
      },
      "expansion": "-metro m",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian masculine suffixes",
        "Italian suffixes",
        "Italian terms derived from Ancient Greek",
        "Italian terms derived from Proto-Indo-European",
        "Italian terms derived from the Proto-Indo-European root *meh₁-"
      ],
      "glosses": [
        "-meter"
      ],
      "links": [
        [
          "-meter",
          "-meter"
        ]
      ],
      "tags": [
        "masculine",
        "morpheme"
      ]
    }
  ],
  "word": "-metro"
}