"busilis" meaning in Spanish

{
  "etymology_text": "Originated as part of a misreading – in an ancient text – of Latin in diēbus illīs (“in those days”) as *in die busillis (“in the day of busilis”), with the last word interpreted as a proper noun.",
  "forms": [
    {
      "form": "busilis",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "busilis m (plural busilis)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "crux (critical part of an argument or issue)"
      ],
      "id": "en-busilis-es-noun-1Bd-6JHF",
      "links": [
        [
          "crux",
          "crux"
        ]
      ],
      "related": [
        {
          "word": "intríngulis"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "busilis"
}

{
  "etymology_text": "Originated as part of a misreading – in an ancient text – of Latin in diēbus illīs (“in those days”) as *in die busillis (“in the day of busilis”), with the last word interpreted as a proper noun.",
  "forms": [
    {
      "form": "busilis",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "busilis m (plural busilis)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "related": [
    {
      "word": "intríngulis"
    }
  ],
  "senses": [
    {
      "categories": [
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish masculine nouns",
        "Spanish nouns"
      ],
      "glosses": [
        "crux (critical part of an argument or issue)"
      ],
      "links": [
        [
          "crux",
          "crux"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "busilis"
}