"lunar caustic" meaning in English

{
  "etymology_text": "See Luna (“silver in alchemy”) + caustic.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "lunar caustic (uncountable)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
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        {
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        },
        {
          "kind": "other",
          "name": "Terms with Bulgarian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Esperanto translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chemistry",
          "orig": "en:Chemistry",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 78:",
          "text": "However, the doctor soon relieved his sufferings, though the treatment was severe; nothing short of an application of lunar caustic allayed the inflammation.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Silver nitrate fused into a stick and used for cauterizing."
      ],
      "id": "en-lunar_caustic-en-noun-lvCYFy32",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "Silver nitrate",
          "silver nitrate"
        ],
        [
          "cauterizing",
          "cauterize"
        ]
      ],
      "raw_glosses": [
        "(chemistry, obsolete) Silver nitrate fused into a stick and used for cauterizing."
      ],
      "tags": [
        "obsolete",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "translations": [
        {
          "code": "bg",
          "lang": "Bulgarian",
          "roman": "adski kamǎk",
          "sense": "silver nitrate fused into a stick",
          "tags": [
            "masculine"
          ],
          "word": "адски камък"
        },
        {
          "code": "eo",
          "lang": "Esperanto",
          "sense": "silver nitrate fused into a stick",
          "word": "lapiso"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "silver nitrate fused into a stick",
          "word": "laapispuikko"
        }
      ]
    }
  ],
  "word": "lunar caustic"
}

{
  "etymology_text": "See Luna (“silver in alchemy”) + caustic.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "lunar caustic (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with obsolete senses",
        "English terms with quotations",
        "English uncountable nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Bulgarian translations",
        "Terms with Esperanto translations",
        "Terms with Finnish translations",
        "en:Chemistry"
      ],
      "examples": [
        {
          "ref": "1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 78:",
          "text": "However, the doctor soon relieved his sufferings, though the treatment was severe; nothing short of an application of lunar caustic allayed the inflammation.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Silver nitrate fused into a stick and used for cauterizing."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "Silver nitrate",
          "silver nitrate"
        ],
        [
          "cauterizing",
          "cauterize"
        ]
      ],
      "raw_glosses": [
        "(chemistry, obsolete) Silver nitrate fused into a stick and used for cauterizing."
      ],
      "tags": [
        "obsolete",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "bg",
      "lang": "Bulgarian",
      "roman": "adski kamǎk",
      "sense": "silver nitrate fused into a stick",
      "tags": [
        "masculine"
      ],
      "word": "адски камък"
    },
    {
      "code": "eo",
      "lang": "Esperanto",
      "sense": "silver nitrate fused into a stick",
      "word": "lapiso"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "silver nitrate fused into a stick",
      "word": "laapispuikko"
    }
  ],
  "word": "lunar caustic"
}