"mercurialist" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mercurial",
        "3": "ist"
      },
      "expansion": "mercurial + -ist",
      "name": "suffix"
    }
  ],
  "etymology_text": "From mercurial + -ist.",
  "forms": [
    {
      "form": "mercurialists",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mercurialist (plural mercurialists)",
      "name": "en-noun"
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  "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"
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          "source": "w"
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          "kind": "other",
          "name": "English terms suffixed with -ist",
          "parents": [],
          "source": "w"
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        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Medicine",
          "orig": "en:Medicine",
          "parents": [
            "Biology",
            "Healthcare",
            "Sciences",
            "Health",
            "All topics",
            "Body",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A doctor who uses mercury or supports its use in medicine."
      ],
      "id": "en-mercurialist-en-noun-qQLGY~1M",
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "doctor",
          "doctor"
        ],
        [
          "mercury",
          "mercury"
        ]
      ],
      "raw_glosses": [
        "(archaic or historical, medicine) A doctor who uses mercury or supports its use in medicine."
      ],
      "tags": [
        "archaic",
        "historical"
      ],
      "topics": [
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "mercurialist"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mercurial",
        "3": "ist"
      },
      "expansion": "mercurial + -ist",
      "name": "suffix"
    }
  ],
  "etymology_text": "From mercurial + -ist.",
  "forms": [
    {
      "form": "mercurialists",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mercurialist (plural mercurialists)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
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        "English lemmas",
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        "English terms with historical senses",
        "Pages with 1 entry",
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        "en:Medicine"
      ],
      "glosses": [
        "A doctor who uses mercury or supports its use in medicine."
      ],
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "doctor",
          "doctor"
        ],
        [
          "mercury",
          "mercury"
        ]
      ],
      "raw_glosses": [
        "(archaic or historical, medicine) A doctor who uses mercury or supports its use in medicine."
      ],
      "tags": [
        "archaic",
        "historical"
      ],
      "topics": [
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "mercurialist"
}