"пѧтъкъ" meaning in Vieux slave

{
  "categories": [
    {
      "kind": "other",
      "name": "Noms communs en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux slave",
      "orig": "vieux slave",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "De пѧть, pętĭ (« cinq ») : « cinquième jour de la semaine »"
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "pętŭkŭ",
    "masculin inanimé"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en vieux slave",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Vendredi."
      ],
      "id": "fr-пѧтъкъ-cu-noun-roDfn2fA"
    }
  ],
  "synonyms": [
    {
      "word": "параскевьгии"
    }
  ],
  "word": "пѧтъкъ"
}

{
  "categories": [
    "Noms communs en vieux slave",
    "vieux slave"
  ],
  "etymology_texts": [
    "De пѧть, pętĭ (« cinq ») : « cinquième jour de la semaine »"
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "pętŭkŭ",
    "masculin inanimé"
  ],
  "senses": [
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en vieux slave"
      ],
      "glosses": [
        "Vendredi."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "параскевьгии"
    }
  ],
  "word": "пѧтъкъ"
}