"Ду" meaning in Biélorusse

{
  "categories": [
    {
      "kind": "other",
      "name": "Départements de France en biélorusse",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en biélorusse issus d’un mot en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms propres en biélorusse",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Biélorusse",
      "orig": "biélorusse",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Transcription du nom français."
  ],
  "lang": "Biélorusse",
  "lang_code": "be",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "glosses": [
        "Doubs, département français."
      ],
      "id": "fr-Ду-be-name-S01JnWID"
    }
  ],
  "word": "Ду"
}

{
  "categories": [
    "Départements de France en biélorusse",
    "Mots en biélorusse issus d’un mot en français",
    "Noms propres en biélorusse",
    "biélorusse"
  ],
  "etymology_texts": [
    "Transcription du nom français."
  ],
  "lang": "Biélorusse",
  "lang_code": "be",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "glosses": [
        "Doubs, département français."
      ]
    }
  ],
  "word": "Ду"
}