"myalgic encephalomyelitis" meaning in English

{
  "head_templates": [
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      "args": {
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      "expansion": "myalgic encephalomyelitis (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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            "Biology",
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      "derived": [
        {
          "tags": [
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          "word": "ME"
        },
        {
          "word": "ME/CFS"
        },
        {
          "word": "myalgic encephalomyelitis"
        },
        {
          "word": "chronic fatigue syndrome"
        }
      ],
      "glosses": [
        "Chronic fatigue syndrome."
      ],
      "id": "en-myalgic_encephalomyelitis-en-noun-cyidKXvX",
      "links": [
        [
          "pathology",
          "pathology"
        ],
        [
          "Chronic fatigue syndrome",
          "chronic fatigue syndrome"
        ]
      ],
      "raw_glosses": [
        "(pathology) Chronic fatigue syndrome."
      ],
      "synonyms": [
        {
          "tags": [
            "abbreviation"
          ],
          "word": "ME"
        }
      ],
      "tags": [
        "uncountable"
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      "topics": [
        "medicine",
        "pathology",
        "sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "disease",
          "word": "myalginen enkefalomyeliitti"
        }
      ]
    }
  ],
  "word": "myalgic encephalomyelitis"
}

{
  "derived": [
    {
      "tags": [
        "abbreviation"
      ],
      "word": "ME"
    },
    {
      "word": "ME/CFS"
    },
    {
      "word": "myalgic encephalomyelitis"
    },
    {
      "word": "chronic fatigue syndrome"
    }
  ],
  "head_templates": [
    {
      "args": {
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      "expansion": "myalgic encephalomyelitis (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English lemmas",
        "English multiword terms",
        "English nouns",
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      "glosses": [
        "Chronic fatigue syndrome."
      ],
      "links": [
        [
          "pathology",
          "pathology"
        ],
        [
          "Chronic fatigue syndrome",
          "chronic fatigue syndrome"
        ]
      ],
      "raw_glosses": [
        "(pathology) Chronic fatigue syndrome."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "medicine",
        "pathology",
        "sciences"
      ]
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  "synonyms": [
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      "word": "ME"
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  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "disease",
      "word": "myalginen enkefalomyeliitti"
    }
  ],
  "word": "myalgic encephalomyelitis"
}