"発煙硫酸" meaning in Japanese

{
  "forms": [
    {
      "form": "発煙硫酸",
      "ruby": [
        [
          "発",
          "はつ"
        ],
        [
          "煙",
          "えん"
        ],
        [
          "硫",
          "りゅう"
        ],
        [
          "酸",
          "さん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "hatsuen ryūsan",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "fatuen riusan",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "はつえんりうさん",
      "roman": "fatuen riusan",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "はつえん りゅうさん",
        "hhira": "はつえん りうさん"
      },
      "expansion": "発(はつ)煙(えん)硫(りゅう)酸(さん) • (hatsuen ryūsan) ^(←はつえんりうさん (fatuen riusan)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 4 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with multiple readings",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "ja",
          "name": "Inorganic compounds",
          "orig": "ja:Inorganic compounds",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "oleum; fuming sulfuric acid"
      ],
      "id": "en-発煙硫酸-ja-noun-y~H2t7FT",
      "links": [
        [
          "inorganic chemistry",
          "inorganic chemistry"
        ],
        [
          "oleum",
          "oleum"
        ],
        [
          "fuming sulfuric acid",
          "fuming sulfuric acid"
        ]
      ],
      "raw_glosses": [
        "(inorganic chemistry) oleum; fuming sulfuric acid"
      ],
      "topics": [
        "chemistry",
        "inorganic-chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "ja:発煙硫酸"
      ]
    }
  ],
  "sounds": [
    {
      "other": "はつえんりゅうさん"
    },
    {
      "ipa": "[ha̠t͡sɨe̞n̺ ɾʲɨːsã̠ɴ]"
    }
  ],
  "word": "発煙硫酸"
}

{
  "forms": [
    {
      "form": "発煙硫酸",
      "ruby": [
        [
          "発",
          "はつ"
        ],
        [
          "煙",
          "えん"
        ],
        [
          "硫",
          "りゅう"
        ],
        [
          "酸",
          "さん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "hatsuen ryūsan",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "fatuen riusan",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "はつえんりうさん",
      "roman": "fatuen riusan",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "はつえん りゅうさん",
        "hhira": "はつえん りうさん"
      },
      "expansion": "発(はつ)煙(えん)硫(りゅう)酸(さん) • (hatsuen ryūsan) ^(←はつえんりうさん (fatuen riusan)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with fifth grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with 4 kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with multiple readings",
        "Japanese terms with redundant sortkeys",
        "Pages with 1 entry",
        "Pages with entries",
        "ja:Inorganic compounds"
      ],
      "glosses": [
        "oleum; fuming sulfuric acid"
      ],
      "links": [
        [
          "inorganic chemistry",
          "inorganic chemistry"
        ],
        [
          "oleum",
          "oleum"
        ],
        [
          "fuming sulfuric acid",
          "fuming sulfuric acid"
        ]
      ],
      "raw_glosses": [
        "(inorganic chemistry) oleum; fuming sulfuric acid"
      ],
      "topics": [
        "chemistry",
        "inorganic-chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "ja:発煙硫酸"
      ]
    }
  ],
  "sounds": [
    {
      "other": "はつえんりゅうさん"
    },
    {
      "ipa": "[ha̠t͡sɨe̞n̺ ɾʲɨːsã̠ɴ]"
    }
  ],
  "word": "発煙硫酸"
}