"моръ" 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"
    }
  ],
  "derived": [
    {
      "lang": "Bulgare",
      "lang_code": "bg",
      "word": "мор"
    },
    {
      "lang": "Russe",
      "lang_code": "ru",
      "word": "мор"
    },
    {
      "lang": "Tchèque",
      "lang_code": "cs",
      "word": "mor"
    }
  ],
  "etymology_texts": [
    "Apparenté à мрѣти, mrěti (« mourir ») : « ce qui fait mourir »."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "morŭ"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en vieux slave de la médecine",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en vieux slave",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Peste, épidémie."
      ],
      "id": "fr-моръ-cu-noun-~mapWKM0",
      "topics": [
        "medicine"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "моръ"
}

{
  "categories": [
    "Noms communs en vieux slave",
    "vieux slave"
  ],
  "derived": [
    {
      "lang": "Bulgare",
      "lang_code": "bg",
      "word": "мор"
    },
    {
      "lang": "Russe",
      "lang_code": "ru",
      "word": "мор"
    },
    {
      "lang": "Tchèque",
      "lang_code": "cs",
      "word": "mor"
    }
  ],
  "etymology_texts": [
    "Apparenté à мрѣти, mrěti (« mourir ») : « ce qui fait mourir »."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "morŭ"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en vieux slave de la médecine",
        "Wiktionnaire:Exemples manquants en vieux slave"
      ],
      "glosses": [
        "Peste, épidémie."
      ],
      "topics": [
        "medicine"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "моръ"
}