"otcu" meaning in Slovaque

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en slovaque",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Slovaque",
      "orig": "slovaque",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "otcovi"
    }
  ],
  "lang": "Slovaque",
  "lang_code": "sk",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Termes archaïques en slovaque",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "otec"
        }
      ],
      "glosses": [
        "Datif singulier de otec."
      ],
      "id": "fr-otcu-sk-noun-DganR7Da",
      "tags": [
        "archaic"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Termes archaïques en slovaque",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "otec"
        }
      ],
      "glosses": [
        "Locatif singulier de otec."
      ],
      "id": "fr-otcu-sk-noun-~kH77WtE",
      "tags": [
        "archaic"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈɔt.t͡su\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "otcu"
}

{
  "categories": [
    "Formes de noms communs en slovaque",
    "slovaque"
  ],
  "forms": [
    {
      "form": "otcovi"
    }
  ],
  "lang": "Slovaque",
  "lang_code": "sk",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        "Termes archaïques en slovaque"
      ],
      "form_of": [
        {
          "word": "otec"
        }
      ],
      "glosses": [
        "Datif singulier de otec."
      ],
      "tags": [
        "archaic"
      ]
    },
    {
      "categories": [
        "Termes archaïques en slovaque"
      ],
      "form_of": [
        {
          "word": "otec"
        }
      ],
      "glosses": [
        "Locatif singulier de otec."
      ],
      "tags": [
        "archaic"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈɔt.t͡su\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "otcu"
}