"литра" meaning in Vieux slave

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots en vieux slave issus d’un mot en grec ancien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Unités de mesure en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux slave",
      "orig": "vieux slave",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du grec ancien λίτρα."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Livre (unité de mesure)."
      ],
      "id": "fr-литра-cu-noun-oLJySfEl"
    }
  ],
  "synonyms": [
    {
      "word": "ливра"
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "литра"
}

{
  "categories": [
    "Mots en vieux slave issus d’un mot en grec ancien",
    "Noms communs en vieux slave",
    "Unités de mesure en vieux slave",
    "vieux slave"
  ],
  "etymology_texts": [
    "Du grec ancien λίτρα."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Livre (unité de mesure)."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "ливра"
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "литра"
}