"rieu" meaning in Français

{
  "anagrams": [
    {
      "word": "Èriu"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Lemmes en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "rieux",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Français de Picardie",
          "orig": "français de Picardie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Bras d’eau entourant un îlot de terre cultivée (hortillon)."
      ],
      "id": "fr-rieu-fr-noun-fU8PuxPa",
      "raw_tags": [
        "Picardie"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ʁi.ø\\"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "rieu"
}

{
  "anagrams": [
    {
      "word": "Èriu"
    }
  ],
  "categories": [
    "Lemmes en français",
    "Noms communs en français",
    "français"
  ],
  "forms": [
    {
      "form": "rieux",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en français",
        "français de Picardie"
      ],
      "glosses": [
        "Bras d’eau entourant un îlot de terre cultivée (hortillon)."
      ],
      "raw_tags": [
        "Picardie"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ʁi.ø\\"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "rieu"
}