"осьлъ" meaning in Vieux slave

{
  "categories": [
    {
      "kind": "other",
      "name": "Animaux en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en vieux slave issus d’un mot en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en vieux slave issus d’un mot en vieux haut allemand",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux slave",
      "orig": "vieux slave",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "осьлѧ"
    },
    {
      "lang": "Biélorusse",
      "lang_code": "be",
      "word": "асел"
    },
    {
      "lang": "Polonais",
      "lang_code": "pl",
      "word": "osioł"
    },
    {
      "lang": "Russe",
      "lang_code": "ru",
      "word": "осёл"
    },
    {
      "lang": "Slovaque",
      "lang_code": "sk",
      "word": "osol"
    },
    {
      "lang": "Tchèque",
      "lang_code": "cs",
      "word": "osel"
    }
  ],
  "etymology_texts": [
    "Du latin asellus par un intermédiaire vieux haut allemand → voir Esel en allemand."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Âne."
      ],
      "id": "fr-осьлъ-cu-noun-YqVuMEZl"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "осьлъ"
}

{
  "categories": [
    "Animaux en vieux slave",
    "Mots en vieux slave issus d’un mot en latin",
    "Mots en vieux slave issus d’un mot en vieux haut allemand",
    "Noms communs en vieux slave",
    "vieux slave"
  ],
  "derived": [
    {
      "word": "осьлѧ"
    },
    {
      "lang": "Biélorusse",
      "lang_code": "be",
      "word": "асел"
    },
    {
      "lang": "Polonais",
      "lang_code": "pl",
      "word": "osioł"
    },
    {
      "lang": "Russe",
      "lang_code": "ru",
      "word": "осёл"
    },
    {
      "lang": "Slovaque",
      "lang_code": "sk",
      "word": "osol"
    },
    {
      "lang": "Tchèque",
      "lang_code": "cs",
      "word": "osel"
    }
  ],
  "etymology_texts": [
    "Du latin asellus par un intermédiaire vieux haut allemand → voir Esel en allemand."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Âne."
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "осьлъ"
}