"gr." meaning in Polish

{
  "head_templates": [
    {
      "args": {
        "1": "m-in"
      },
      "expansion": "gr. m inan",
      "name": "pl-noun"
    }
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "grecki"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Polish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of grecki."
      ],
      "id": "en-gr.-pl-noun-6qP~XQT4",
      "links": [
        [
          "grecki",
          "grecki#Polish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "inanimate",
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈɡrɛt͡s.ki/"
    },
    {
      "rhymes": "-ɛt͡ski"
    }
  ],
  "word": "gr."
}

{
  "head_templates": [
    {
      "args": {
        "1": "m-in"
      },
      "expansion": "gr. m inan",
      "name": "pl-noun"
    }
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "grecki"
        }
      ],
      "categories": [
        "Polish 2-syllable words",
        "Polish abbreviations",
        "Polish entries with incorrect language header",
        "Polish inanimate nouns",
        "Polish lemmas",
        "Polish links with redundant wikilinks",
        "Polish masculine nouns",
        "Polish nouns",
        "Polish terms spelled with .",
        "Polish terms with IPA pronunciation",
        "Rhymes:Polish/ɛt͡ski"
      ],
      "glosses": [
        "Abbreviation of grecki."
      ],
      "links": [
        [
          "grecki",
          "grecki#Polish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "inanimate",
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈɡrɛt͡s.ki/"
    },
    {
      "rhymes": "-ɛt͡ski"
    }
  ],
  "word": "gr."
}