"gas water" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "text": "1852-1866, Charles Tomlinson, Cyclopaedia of Useful Arts and Manufactures\nThe tar and ammoniacal liquor or gas water are collected in the tar cistern, in which the tar occupies the lowest position."
        }
      ],
      "glosses": [
        "Water through which gas has been passed for purification, and used for the manufacture of sal ammoniac, carbonate of ammonia, and Prussian blue."
      ],
      "id": "en-gas_water-en-noun-Loir2RRg",
      "links": [
        [
          "purification",
          "purification"
        ],
        [
          "manufacture",
          "manufacture"
        ],
        [
          "sal ammoniac",
          "sal ammoniac"
        ],
        [
          "carbonate",
          "carbonate"
        ],
        [
          "ammonia",
          "ammonia"
        ],
        [
          "Prussian blue",
          "Prussian blue"
        ]
      ],
      "synonyms": [
        {
          "word": "ammoniacal water"
        },
        {
          "word": "gas liquor"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "gas water"
}

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "text": "1852-1866, Charles Tomlinson, Cyclopaedia of Useful Arts and Manufactures\nThe tar and ammoniacal liquor or gas water are collected in the tar cistern, in which the tar occupies the lowest position."
        }
      ],
      "glosses": [
        "Water through which gas has been passed for purification, and used for the manufacture of sal ammoniac, carbonate of ammonia, and Prussian blue."
      ],
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        [
          "purification",
          "purification"
        ],
        [
          "manufacture",
          "manufacture"
        ],
        [
          "sal ammoniac",
          "sal ammoniac"
        ],
        [
          "carbonate",
          "carbonate"
        ],
        [
          "ammonia",
          "ammonia"
        ],
        [
          "Prussian blue",
          "Prussian blue"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "ammoniacal water"
    },
    {
      "word": "gas liquor"
    }
  ],
  "word": "gas water"
}