"cluster headache" meaning in English

{
  "etymology_text": "So called because such headaches tend to occur together, i.e. in clusters.",
  "forms": [
    {
      "form": "cluster headaches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "cluster headache (plural cluster headaches)",
      "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": "Mandarin terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Pathology",
          "orig": "en:Pathology",
          "parents": [
            "Medicine",
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An extremely painful, cyclical and unilateral headache."
      ],
      "id": "en-cluster_headache-en-noun-l7WrOvz~",
      "links": [
        [
          "pathology",
          "pathology"
        ],
        [
          "cyclical",
          "cyclical"
        ],
        [
          "unilateral",
          "unilateral"
        ],
        [
          "headache",
          "headache"
        ]
      ],
      "raw_glosses": [
        "(pathology) An extremely painful, cyclical and unilateral headache."
      ],
      "synonyms": [
        {
          "word": "Raeder's syndrome"
        },
        {
          "word": "suicide headache"
        }
      ],
      "topics": [
        "medicine",
        "pathology",
        "sciences"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "extremely painful headache",
          "word": "叢集性頭痛"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "cóngjíxìng tóutòng",
          "sense": "extremely painful headache",
          "word": "丛集性头痛"
        },
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "extremely painful headache",
          "tags": [
            "feminine"
          ],
          "word": "clusterhoofdpijn"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "extremely painful headache",
          "word": "sarjoittainen päänsärky"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "extremely painful headache",
          "tags": [
            "informal"
          ],
          "word": "itsemurhapäänsärky"
        },
        {
          "code": "nb",
          "lang": "Norwegian Bokmål",
          "sense": "extremely painful headache",
          "tags": [
            "feminine",
            "masculine"
          ],
          "word": "klasehodepine"
        }
      ],
      "wikipedia": [
        "cluster headache"
      ]
    }
  ],
  "word": "cluster headache"
}

{
  "etymology_text": "So called because such headaches tend to occur together, i.e. in clusters.",
  "forms": [
    {
      "form": "cluster headaches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "cluster headache (plural cluster headaches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Mandarin terms with redundant transliterations",
        "en:Pathology"
      ],
      "glosses": [
        "An extremely painful, cyclical and unilateral headache."
      ],
      "links": [
        [
          "pathology",
          "pathology"
        ],
        [
          "cyclical",
          "cyclical"
        ],
        [
          "unilateral",
          "unilateral"
        ],
        [
          "headache",
          "headache"
        ]
      ],
      "raw_glosses": [
        "(pathology) An extremely painful, cyclical and unilateral headache."
      ],
      "topics": [
        "medicine",
        "pathology",
        "sciences"
      ],
      "wikipedia": [
        "cluster headache"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Raeder's syndrome"
    },
    {
      "word": "suicide headache"
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "extremely painful headache",
      "word": "叢集性頭痛"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "cóngjíxìng tóutòng",
      "sense": "extremely painful headache",
      "word": "丛集性头痛"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "extremely painful headache",
      "tags": [
        "feminine"
      ],
      "word": "clusterhoofdpijn"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "extremely painful headache",
      "word": "sarjoittainen päänsärky"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "extremely painful headache",
      "tags": [
        "informal"
      ],
      "word": "itsemurhapäänsärky"
    },
    {
      "code": "nb",
      "lang": "Norwegian Bokmål",
      "sense": "extremely painful headache",
      "tags": [
        "feminine",
        "masculine"
      ],
      "word": "klasehodepine"
    }
  ],
  "word": "cluster headache"
}