"Widal test" meaning in English

{
  "etymology_text": "Named after Georges-Fernand Widal (1862-1929), French physician.",
  "forms": [
    {
      "form": "Widal tests",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Widal test (plural Widal tests)",
      "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": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The agglutination test for typhoid fever."
      ],
      "id": "en-Widal_test-en-noun-7YIJdSxW",
      "links": [
        [
          "agglutination",
          "agglutination"
        ],
        [
          "test",
          "test"
        ],
        [
          "typhoid",
          "typhoid"
        ],
        [
          "fever",
          "fever"
        ]
      ],
      "synonyms": [
        {
          "word": "Widal reaction"
        },
        {
          "word": "Widal's test"
        }
      ],
      "wikipedia": [
        "Georges-Fernand Widal",
        "Widal test"
      ]
    }
  ],
  "word": "Widal test"
}

{
  "etymology_text": "Named after Georges-Fernand Widal (1862-1929), French physician.",
  "forms": [
    {
      "form": "Widal tests",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Widal test (plural Widal tests)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys"
      ],
      "glosses": [
        "The agglutination test for typhoid fever."
      ],
      "links": [
        [
          "agglutination",
          "agglutination"
        ],
        [
          "test",
          "test"
        ],
        [
          "typhoid",
          "typhoid"
        ],
        [
          "fever",
          "fever"
        ]
      ],
      "wikipedia": [
        "Georges-Fernand Widal",
        "Widal test"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Widal reaction"
    },
    {
      "word": "Widal's test"
    }
  ],
  "word": "Widal test"
}