"chemical engine" meaning in English

{
  "forms": [
    {
      "form": "chemical engines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chemical engine (plural chemical engines)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Firefighting",
          "orig": "en:Firefighting",
          "parents": [
            "Emergency services",
            "Fire",
            "Public safety",
            "Combustion",
            "Light sources",
            "Public administration",
            "Security",
            "Chemical processes",
            "Light",
            "Government",
            "Society",
            "Nature",
            "Energy",
            "Politics",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "fire extinguisher"
        },
        {
          "word": "fire grenade"
        },
        {
          "word": "fire engine"
        },
        {
          "word": "fire bucket"
        },
        {
          "word": "fire blanket"
        }
      ],
      "glosses": [
        "A large cart-mounted fire extinguisher using caustic chemical-extinguishing chemicals."
      ],
      "id": "en-chemical_engine-en-noun-6AScZuOw",
      "links": [
        [
          "firefighting",
          "firefighting"
        ],
        [
          "fire extinguisher",
          "fire extinguisher"
        ],
        [
          "caustic",
          "caustic"
        ]
      ],
      "raw_glosses": [
        "(historical, 19th century, firefighting) A large cart-mounted fire extinguisher using caustic chemical-extinguishing chemicals."
      ],
      "tags": [
        "historical",
        "obsolete"
      ],
      "topics": [
        "firefighting",
        "government"
      ]
    }
  ],
  "word": "chemical engine"
}

{
  "coordinate_terms": [
    {
      "word": "fire extinguisher"
    },
    {
      "word": "fire grenade"
    },
    {
      "word": "fire engine"
    },
    {
      "word": "fire bucket"
    },
    {
      "word": "fire blanket"
    }
  ],
  "forms": [
    {
      "form": "chemical engines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chemical engine (plural chemical engines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "en:Firefighting"
      ],
      "glosses": [
        "A large cart-mounted fire extinguisher using caustic chemical-extinguishing chemicals."
      ],
      "links": [
        [
          "firefighting",
          "firefighting"
        ],
        [
          "fire extinguisher",
          "fire extinguisher"
        ],
        [
          "caustic",
          "caustic"
        ]
      ],
      "raw_glosses": [
        "(historical, 19th century, firefighting) A large cart-mounted fire extinguisher using caustic chemical-extinguishing chemicals."
      ],
      "tags": [
        "historical",
        "obsolete"
      ],
      "topics": [
        "firefighting",
        "government"
      ]
    }
  ],
  "word": "chemical engine"
}