"nitrifier" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "nitrify",
        "3": "er",
        "id2": "agent noun"
      },
      "expansion": "nitrify + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "nitrify + -er",
  "forms": [
    {
      "form": "nitrifiers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "nitrifier (plural nitrifiers)",
      "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"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -er (agent noun)",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chemistry",
          "orig": "en:Chemistry",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An agent employed in nitrification."
      ],
      "id": "en-nitrifier-en-noun-XgY9p9nj",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "agent",
          "agent"
        ],
        [
          "nitrification",
          "nitrification"
        ]
      ],
      "raw_glosses": [
        "(chemistry) An agent employed in nitrification."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "nitrifier"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "nitrify",
        "3": "er",
        "id2": "agent noun"
      },
      "expansion": "nitrify + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "nitrify + -er",
  "forms": [
    {
      "form": "nitrifiers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "nitrifier (plural nitrifiers)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er (agent noun)",
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      ],
      "glosses": [
        "An agent employed in nitrification."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "agent",
          "agent"
        ],
        [
          "nitrification",
          "nitrification"
        ]
      ],
      "raw_glosses": [
        "(chemistry) An agent employed in nitrification."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "nitrifier"
}