"حروف الجر" meaning in Arabic

{
  "forms": [
    {
      "form": "حُرُوف الجَرّ",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ḥurūf al-jarr",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Arabic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "ḥarf al-jarr",
          "word": "حَرْف الجَرّ"
        }
      ],
      "glosses": [
        "plural of حَرْف الجَرّ (ḥarf al-jarr)"
      ],
      "id": "en-حروف_الجر-ar-noun-aZNKWJWS",
      "links": [
        [
          "حَرْف الجَرّ",
          "حرف الجر#Arabic"
        ]
      ],
      "tags": [
        "form-of",
        "plural"
      ]
    }
  ],
  "word": "حروف الجر"
}

{
  "forms": [
    {
      "form": "حُرُوف الجَرّ",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ḥurūf al-jarr",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Arabic entries with incorrect language header",
        "Arabic non-lemma forms",
        "Arabic noun forms"
      ],
      "form_of": [
        {
          "extra": "ḥarf al-jarr",
          "word": "حَرْف الجَرّ"
        }
      ],
      "glosses": [
        "plural of حَرْف الجَرّ (ḥarf al-jarr)"
      ],
      "links": [
        [
          "حَرْف الجَرّ",
          "حرف الجر#Arabic"
        ]
      ],
      "tags": [
        "form-of",
        "plural"
      ]
    }
  ],
  "word": "حروف الجر"
}