"experimentum crucis" meaning in English

{
  "etymology_text": "Modern Latin. From Latin experimentum crucis, \"experiment of the cross\".",
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      "expansion": "experimentum crucis (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "English entries with incorrect language header",
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      "examples": [
        {
          "ref": "1855, Sir Richard Burton, Personal Narrative of a Pilgrimage to Al-Madinah & Meccah, Dover, published 1964, page 2:",
          "text": "What remained for me but to prove, by trial, that what might be perilous to other travellers was safe to me? The “experimentum crucis” was a visit to Al-Híjaz, at once the most difficult and the most dangerous point by which a European can enter Arabia.https://en.wikisource.org/wiki/Personal_Narrative_of_a_Pilgrimage_to_Al_Madinah_and_Meccah/Volume_I",
          "type": "quote"
        }
      ],
      "glosses": [
        "A \"crucial experiment\"; a conclusive test to decide between different hypotheses."
      ],
      "id": "en-experimentum_crucis-en-noun-mftyo5jO",
      "tags": [
        "uncountable"
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      "wikipedia": [
        "experimentum crucis"
      ]
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  ],
  "word": "experimentum crucis"
}

{
  "etymology_text": "Modern Latin. From Latin experimentum crucis, \"experiment of the cross\".",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "experimentum crucis (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 quotations",
        "English uncountable nouns",
        "Pages with 1 entry",
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      ],
      "examples": [
        {
          "ref": "1855, Sir Richard Burton, Personal Narrative of a Pilgrimage to Al-Madinah & Meccah, Dover, published 1964, page 2:",
          "text": "What remained for me but to prove, by trial, that what might be perilous to other travellers was safe to me? The “experimentum crucis” was a visit to Al-Híjaz, at once the most difficult and the most dangerous point by which a European can enter Arabia.https://en.wikisource.org/wiki/Personal_Narrative_of_a_Pilgrimage_to_Al_Madinah_and_Meccah/Volume_I",
          "type": "quote"
        }
      ],
      "glosses": [
        "A \"crucial experiment\"; a conclusive test to decide between different hypotheses."
      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "experimentum crucis"
      ]
    }
  ],
  "word": "experimentum crucis"
}