"Nordhausen acid" meaning in English

{
  "etymology_text": "From Nordhausen in Germany, once the place of its manufacture.",
  "forms": [
    {
      "form": "Nordhausen acids",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "Nordhausen acid (countable and uncountable, plural Nordhausen acids)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of oleum (“solution of sulfur trioxide in sulfuric acid”)"
      ],
      "id": "en-Nordhausen_acid-en-noun-r49BksL0",
      "links": [
        [
          "oleum",
          "oleum#English"
        ]
      ],
      "synonyms": [
        {
          "extra": "solution of sulfur trioxide in sulfuric acid",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "oleum"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "Nordhausen acid"
}

{
  "etymology_text": "From Nordhausen in Germany, once the place of its manufacture.",
  "forms": [
    {
      "form": "Nordhausen acids",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "Nordhausen acid (countable and uncountable, plural Nordhausen acids)",
      "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 uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Synonym of oleum (“solution of sulfur trioxide in sulfuric acid”)"
      ],
      "links": [
        [
          "oleum",
          "oleum#English"
        ]
      ],
      "synonyms": [
        {
          "extra": "solution of sulfur trioxide in sulfuric acid",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "oleum"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "Nordhausen acid"
}