"gravières" meaning in Français

{
  "anagrams": [
    {
      "word": "grèverais"
    },
    {
      "word": "gréverais"
    },
    {
      "word": "regravies"
    },
    {
      "word": "regrevais"
    },
    {
      "word": "vergerais"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "gravière",
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en français",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              64,
              73
            ]
          ],
          "ref": "Monique Gasser, Jean Varlet, Michel Bakalowicz, Autoroutes et aménagements, 2004",
          "text": "Le fait est qu’en matière de zones humides à « renaturer », les gravières sont diversement traitées."
        }
      ],
      "form_of": [
        {
          "word": "gravière"
        }
      ],
      "glosses": [
        "Pluriel de gravière."
      ],
      "id": "fr-gravières-fr-noun-w1sv4X-u"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ɡʁa.vjɛʁ\\"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "gravières"
}

{
  "anagrams": [
    {
      "word": "grèverais"
    },
    {
      "word": "gréverais"
    },
    {
      "word": "regravies"
    },
    {
      "word": "regrevais"
    },
    {
      "word": "vergerais"
    }
  ],
  "categories": [
    "Formes de noms communs en français",
    "français"
  ],
  "forms": [
    {
      "form": "gravière",
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        "Exemples en français"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              64,
              73
            ]
          ],
          "ref": "Monique Gasser, Jean Varlet, Michel Bakalowicz, Autoroutes et aménagements, 2004",
          "text": "Le fait est qu’en matière de zones humides à « renaturer », les gravières sont diversement traitées."
        }
      ],
      "form_of": [
        {
          "word": "gravière"
        }
      ],
      "glosses": [
        "Pluriel de gravière."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ɡʁa.vjɛʁ\\"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "gravières"
}