"mercury barometer" meaning in English

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      "expansion": "mercury barometer (plural mercury barometers)",
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  "lang_code": "en",
  "pos": "noun",
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          "name": "Measuring instruments",
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          "langcode": "en",
          "name": "Mercury (element)",
          "orig": "en:Mercury (element)",
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      ],
      "glosses": [
        "A barometer which indicates the atmospheric pressure by measuring the height of a column of mercury in a vertical, evacuated tube."
      ],
      "id": "en-mercury_barometer-en-noun-F4jKvxxF",
      "links": [
        [
          "atmospheric pressure",
          "atmospheric pressure"
        ],
        [
          "height",
          "height"
        ],
        [
          "column",
          "column"
        ]
      ],
      "related": [
        {
          "word": "aneroid barometer"
        }
      ],
      "synonyms": [
        {
          "word": "Torricellian barometer"
        }
      ]
    }
  ],
  "word": "mercury barometer"
}

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    {
      "form": "mercury barometers",
      "tags": [
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  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "aneroid barometer"
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        "en:Measuring instruments",
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      "glosses": [
        "A barometer which indicates the atmospheric pressure by measuring the height of a column of mercury in a vertical, evacuated tube."
      ],
      "links": [
        [
          "atmospheric pressure",
          "atmospheric pressure"
        ],
        [
          "height",
          "height"
        ],
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          "column",
          "column"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Torricellian barometer"
    }
  ],
  "word": "mercury barometer"
}