"diatessaron" meaning in Latin

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots indéclinables en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du grec ancien διά, diá (« par ») et τεσσάρων, tessárôn (« quatre »)."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "noun",
  "pos_id": "la-nom-1",
  "pos_title": "Nom commun",
  "raw_tags": [
    "indéclinable"
  ],
  "related": [
    {
      "word": "diapason"
    },
    {
      "word": "diapente"
    },
    {
      "word": "diatonicus"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en latin de la pharmacie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Diatessaron."
      ],
      "id": "fr-diatessaron-la-noun-9djCDUJJ",
      "raw_tags": [
        "Pharmacie"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en latin de la musique",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Quarte."
      ],
      "id": "fr-diatessaron-la-noun-H8jJjw8w",
      "topics": [
        "music"
      ]
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "diatessaron"
}

{
  "categories": [
    "Mots indéclinables en latin",
    "latin"
  ],
  "etymology_texts": [
    "Du grec ancien διά, diá (« par ») et τεσσάρων, tessárôn (« quatre »)."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "noun",
  "pos_id": "la-nom-1",
  "pos_title": "Nom commun",
  "raw_tags": [
    "indéclinable"
  ],
  "related": [
    {
      "word": "diapason"
    },
    {
      "word": "diapente"
    },
    {
      "word": "diatonicus"
    }
  ],
  "senses": [
    {
      "categories": [
        "Lexique en latin de la pharmacie"
      ],
      "glosses": [
        "Diatessaron."
      ],
      "raw_tags": [
        "Pharmacie"
      ]
    },
    {
      "categories": [
        "Lexique en latin de la musique"
      ],
      "glosses": [
        "Quarte."
      ],
      "topics": [
        "music"
      ]
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "diatessaron"
}