"rock water" meaning in English

{
  "forms": [
    {
      "form": "rock waters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "rock water (countable and uncountable, plural rock waters)",
      "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",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1860, Harriet Elizabeth Prescott Spofford, Sir Rohan's Ghost",
          "text": "‘It is as sparkling and transparent as rockwater,’ said Mr. Redruth.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Spring water as issued from beneath rocks, seen as being especially pure, clean or healthy."
      ],
      "id": "en-rock_water-en-noun-h4HDDVvf",
      "links": [
        [
          "Spring water",
          "spring water"
        ],
        [
          "pure",
          "pure"
        ],
        [
          "clean",
          "clean"
        ],
        [
          "healthy",
          "healthy"
        ]
      ],
      "synonyms": [
        {
          "word": "rockwater"
        },
        {
          "word": "rock-water"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "rock water"
}

{
  "forms": [
    {
      "form": "rock waters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "rock water (countable and uncountable, plural rock waters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "English uncountable nouns",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1860, Harriet Elizabeth Prescott Spofford, Sir Rohan's Ghost",
          "text": "‘It is as sparkling and transparent as rockwater,’ said Mr. Redruth.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Spring water as issued from beneath rocks, seen as being especially pure, clean or healthy."
      ],
      "links": [
        [
          "Spring water",
          "spring water"
        ],
        [
          "pure",
          "pure"
        ],
        [
          "clean",
          "clean"
        ],
        [
          "healthy",
          "healthy"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "rockwater"
    },
    {
      "word": "rock-water"
    }
  ],
  "word": "rock water"
}