"petrologist" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "petrology",
        "3": "ist"
      },
      "expansion": "petrology + -ist",
      "name": "suffix"
    }
  ],
  "etymology_text": "petrology + -ist",
  "forms": [
    {
      "form": "petrologists",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "petrologist (plural petrologists)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "name": "English terms suffixed with -ist",
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          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2018, Tim Flannery, Europe: A Natural History, page 76",
          "text": "As Kirkpatrick worked, Otto Hahn - an intensely patriotic German lawyer and amateur petrologist turned Swedenborgian who believed life originated in outer space - was spending long hours staring down his microscope at what he took to be the fossilised remnants of algae.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A geologist who specializes in petrology."
      ],
      "id": "en-petrologist-en-noun-~5iDwfla",
      "links": [
        [
          "geologist",
          "geologist"
        ],
        [
          "petrology",
          "petrology"
        ]
      ]
    }
  ],
  "word": "petrologist"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "petrology",
        "3": "ist"
      },
      "expansion": "petrology + -ist",
      "name": "suffix"
    }
  ],
  "etymology_text": "petrology + -ist",
  "forms": [
    {
      "form": "petrologists",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "petrologist (plural petrologists)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English entries with incorrect language header",
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      "examples": [
        {
          "ref": "2018, Tim Flannery, Europe: A Natural History, page 76",
          "text": "As Kirkpatrick worked, Otto Hahn - an intensely patriotic German lawyer and amateur petrologist turned Swedenborgian who believed life originated in outer space - was spending long hours staring down his microscope at what he took to be the fossilised remnants of algae.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A geologist who specializes in petrology."
      ],
      "links": [
        [
          "geologist",
          "geologist"
        ],
        [
          "petrology",
          "petrology"
        ]
      ]
    }
  ],
  "word": "petrologist"
}