"freshwater hydra" meaning in English

{
  "forms": [
    {
      "form": "freshwater hydras",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "freshwater hydra (plural freshwater hydras)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "name": "Terms with Maori translations",
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        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Hydrozoans",
          "orig": "en:Hydrozoans",
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            "Cnidarians",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
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          "source": "w"
        }
      ],
      "glosses": [
        "Hydra vulgaris, a solitary polyp about 10 mm long, usually found attached to the under surfaces of water plants in ponds and streams. Similar to a sea anemone consisting of a hollow cylinder with a mouth surrounded by tentacles."
      ],
      "id": "en-freshwater_hydra-en-noun-rDidJdDy",
      "translations": [
        {
          "code": "mi",
          "lang": "Maori",
          "sense": "as above",
          "word": "huru moana"
        }
      ]
    }
  ],
  "word": "freshwater hydra"
}

{
  "forms": [
    {
      "form": "freshwater hydras",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "freshwater hydra (plural freshwater hydras)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
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        "English lemmas",
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        "English terms with non-redundant non-automated sortkeys",
        "Entries using missing taxonomic name (species)",
        "Terms with Maori translations",
        "en:Hydrozoans"
      ],
      "glosses": [
        "Hydra vulgaris, a solitary polyp about 10 mm long, usually found attached to the under surfaces of water plants in ponds and streams. Similar to a sea anemone consisting of a hollow cylinder with a mouth surrounded by tentacles."
      ]
    }
  ],
  "translations": [
    {
      "code": "mi",
      "lang": "Maori",
      "sense": "as above",
      "word": "huru moana"
    }
  ],
  "word": "freshwater hydra"
}