"marron d’eau" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions nominales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "marrons d’eau",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Plantes en français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en français",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Plante à fleurs aquatique de la famille des trapacées originaire d’Afrique, d’Asie et d’Europe centrale (Trapa natans)."
      ],
      "id": "fr-marron_d’eau-fr-noun-vXqjBzqe",
      "topics": [
        "botany"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ma.ʁɔ̃ d‿o\\"
    }
  ],
  "synonyms": [
    {
      "word": "châtaigne aquatique"
    },
    {
      "word": "châtaigne d’eau"
    },
    {
      "raw_tags": [
        "Canada"
      ],
      "word": "cornelle"
    },
    {
      "word": "cornes du diable"
    },
    {
      "word": "cornes-du-diable"
    },
    {
      "word": "mâcre flottante"
    },
    {
      "word": "mâcre nageante"
    },
    {
      "word": "noix aquatique"
    },
    {
      "word": "truffe d’eau"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "marron d’eau"
}

{
  "categories": [
    "Locutions nominales en français",
    "français"
  ],
  "forms": [
    {
      "form": "marrons d’eau",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Plantes en français",
        "Wiktionnaire:Exemples manquants en français"
      ],
      "glosses": [
        "Plante à fleurs aquatique de la famille des trapacées originaire d’Afrique, d’Asie et d’Europe centrale (Trapa natans)."
      ],
      "topics": [
        "botany"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ma.ʁɔ̃ d‿o\\"
    }
  ],
  "synonyms": [
    {
      "word": "châtaigne aquatique"
    },
    {
      "word": "châtaigne d’eau"
    },
    {
      "raw_tags": [
        "Canada"
      ],
      "word": "cornelle"
    },
    {
      "word": "cornes du diable"
    },
    {
      "word": "cornes-du-diable"
    },
    {
      "word": "mâcre flottante"
    },
    {
      "word": "mâcre nageante"
    },
    {
      "word": "noix aquatique"
    },
    {
      "word": "truffe d’eau"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "marron d’eau"
}