"rzęsa" meaning in Polonais

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots en polonais issus d’un mot en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en polonais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Polonais",
      "orig": "polonais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du vieux slave ręsa qui donne aussi řasa (« cil, algue ») en tchèque."
  ],
  "lang": "Polonais",
  "lang_code": "pl",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en polonais de l’anatomie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Cil."
      ],
      "id": "fr-rzęsa-pl-noun--kyul56g",
      "topics": [
        "anatomy"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Plantes en polonais",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Lentille d’eau."
      ],
      "id": "fr-rzęsa-pl-noun-ib8HYGe1",
      "topics": [
        "botany"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "dzierzęga"
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "rzęsa"
}

{
  "categories": [
    "Mots en polonais issus d’un mot en vieux slave",
    "Noms communs en polonais",
    "polonais"
  ],
  "etymology_texts": [
    "Du vieux slave ręsa qui donne aussi řasa (« cil, algue ») en tchèque."
  ],
  "lang": "Polonais",
  "lang_code": "pl",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Lexique en polonais de l’anatomie"
      ],
      "glosses": [
        "Cil."
      ],
      "topics": [
        "anatomy"
      ]
    },
    {
      "categories": [
        "Plantes en polonais"
      ],
      "glosses": [
        "Lentille d’eau."
      ],
      "topics": [
        "botany"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "dzierzęga"
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "rzęsa"
}