"fifth disease" meaning in English

{
  "etymology_text": "Historically classified as the fifth of the classical childhood skin rashes or exanthems, after measles, scarlet fever, rubella, and Dukes' disease.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "fifth disease (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"
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          "source": "w"
        },
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          "kind": "other",
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        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant script codes",
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        {
          "kind": "other",
          "name": "Terms with Japanese translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Mandarin translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Diseases",
          "orig": "en:Diseases",
          "parents": [
            "Disease",
            "Health",
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Viral diseases",
          "orig": "en:Viral diseases",
          "parents": [
            "Diseases",
            "Disease",
            "Health",
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The manifestation as rashes of an infection by erythrovirus."
      ],
      "id": "en-fifth_disease-en-noun-HFv1imNA",
      "links": [
        [
          "pathology",
          "pathology"
        ],
        [
          "manifestation",
          "manifestation"
        ],
        [
          "rash",
          "rash"
        ],
        [
          "infection",
          "infection"
        ],
        [
          "erythrovirus",
          "erythrovirus"
        ]
      ],
      "raw_glosses": [
        "(pathology) The manifestation as rashes of an infection by erythrovirus."
      ],
      "synonyms": [
        {
          "word": "erythema infectiosum"
        },
        {
          "word": "slap face"
        },
        {
          "word": "slapcheek"
        },
        {
          "word": "slapped cheek syndrome"
        },
        {
          "word": "slapped face"
        }
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "medicine",
        "pathology",
        "sciences"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "manifestation of erythovirus infection",
          "word": "傳染性紅斑"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "chuánrǎnxìng hóngbān",
          "sense": "manifestation of erythovirus infection",
          "word": "传染性红斑"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "manifestation of erythovirus infection",
          "word": "parvorokko"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "manifestation of erythovirus infection",
          "word": "pikkurokko"
        },
        {
          "alt": "りんごびょう",
          "code": "ja",
          "lang": "Japanese",
          "roman": "ringobyō",
          "sense": "manifestation of erythovirus infection",
          "word": "林檎病"
        }
      ],
      "wikipedia": [
        "fifth disease"
      ]
    }
  ],
  "word": "fifth disease"
}

{
  "etymology_text": "Historically classified as the fifth of the classical childhood skin rashes or exanthems, after measles, scarlet fever, rubella, and Dukes' disease.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "fifth disease (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
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        "Japanese terms with redundant script codes",
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        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with Japanese translations",
        "Terms with Mandarin translations",
        "en:Diseases",
        "en:Viral diseases"
      ],
      "glosses": [
        "The manifestation as rashes of an infection by erythrovirus."
      ],
      "links": [
        [
          "pathology",
          "pathology"
        ],
        [
          "manifestation",
          "manifestation"
        ],
        [
          "rash",
          "rash"
        ],
        [
          "infection",
          "infection"
        ],
        [
          "erythrovirus",
          "erythrovirus"
        ]
      ],
      "raw_glosses": [
        "(pathology) The manifestation as rashes of an infection by erythrovirus."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "medicine",
        "pathology",
        "sciences"
      ],
      "wikipedia": [
        "fifth disease"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "erythema infectiosum"
    },
    {
      "word": "slap face"
    },
    {
      "word": "slapcheek"
    },
    {
      "word": "slapped cheek syndrome"
    },
    {
      "word": "slapped face"
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "manifestation of erythovirus infection",
      "word": "傳染性紅斑"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "chuánrǎnxìng hóngbān",
      "sense": "manifestation of erythovirus infection",
      "word": "传染性红斑"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "manifestation of erythovirus infection",
      "word": "parvorokko"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "manifestation of erythovirus infection",
      "word": "pikkurokko"
    },
    {
      "alt": "りんごびょう",
      "code": "ja",
      "lang": "Japanese",
      "roman": "ringobyō",
      "sense": "manifestation of erythovirus infection",
      "word": "林檎病"
    }
  ],
  "word": "fifth disease"
}