"gris fer" meaning in Francese

{
  "categories": [
    {
      "kind": "other",
      "name": "Colori",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Colori RAL",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Colori RAL – francese",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Sostantivi in francese",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Francese",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Sostantivo",
  "senses": [
    {
      "glosses": [
        "grigio ferro"
      ],
      "id": "it-gris_fer-fr-noun-TuRNvXx6",
      "topics": [
        "color"
      ]
    }
  ],
  "word": "gris fer"
}

{
  "categories": [
    "Colori",
    "Colori RAL",
    "Colori RAL – francese",
    "Sostantivi in francese"
  ],
  "lang": "Francese",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Sostantivo",
  "senses": [
    {
      "glosses": [
        "grigio ferro"
      ],
      "topics": [
        "color"
      ]
    }
  ],
  "word": "gris fer"
}