"علم المياهيات" meaning in Arabe

{
  "categories": [
    {
      "kind": "other",
      "name": "Genres manquants en arabe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en arabe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms de sciences en arabe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Arabe",
      "orig": "arabe",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Arabe",
  "lang_code": "ar",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "raw_tags": [
    "genre à préciser : {{m}}, {{f}}, {{mf}}, {{n}} ?"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en arabe des sciences",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Hydrologie."
      ],
      "id": "fr-علم_المياهيات-ar-noun-TFgWHU0h",
      "topics": [
        "science"
      ]
    }
  ],
  "word": "علم المياهيات"
}

{
  "categories": [
    "Genres manquants en arabe",
    "Locutions nominales en arabe",
    "Noms de sciences en arabe",
    "arabe"
  ],
  "lang": "Arabe",
  "lang_code": "ar",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "raw_tags": [
    "genre à préciser : {{m}}, {{f}}, {{mf}}, {{n}} ?"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en arabe des sciences"
      ],
      "glosses": [
        "Hydrologie."
      ],
      "topics": [
        "science"
      ]
    }
  ],
  "word": "علم المياهيات"
}