We found 23 dictionaries that define the word cluster headache:

General (12 matching dictionaries)

1. cluster headache: Merriam-Webster
2. cluster headache: Oxford Learner's Dictionaries
3. cluster headache: American Heritage Dictionary of the English Language
4. cluster headache: Vocabulary.com
5. cluster headache: Wiktionary
6. cluster headache: Infoplease Dictionary
7. cluster headache: Dictionary.com
8. Cluster headache: Wikipedia, the Free Encyclopedia
9. cluster headache: Rhymezone
10. cluster headache: FreeDictionary.org
11. cluster headache: Mnemonic Dictionary
12. cluster headache: TheFreeDictionary.com

Computing (1 matching dictionary)

13. Headache, cluster, cluster headache: Encyclopedia

Medicine (9 matching dictionaries)

14. cluster headache: Merriam-Webster Medical Dictionary
15. Dorland's Illustrated Medical Dictionary (No longer online)
16. Cluster headache, Headache, cluster: MedTerms.com Medical Dictionary
17. Medical Dictionary (No longer online)
18. Cluster headache: Merck Manuals
19. online medical dictionary (No longer online)
20. Cluster headache: MEDLINE plus Illustrated Medical Encyclopedia
21. Headache, cluster, cluster headache: Medical dictionary
22. Cluster headache, Headache, cluster: Drug Medical Dictionary

Slang (1 matching dictionary)

23. Cluster Headache: Urban Dictionary

(Note: See cluster_headaches as well.)

Definitions from Wiktionary (cluster headache) ▸ noun:  (pathology) An extremely painful, cyclical and unilateral headache. Similar: histamine headache, hemicrania, cephalea, suicide headache, amphicrania, cephalodynia, migraine, occipitalgia, cephalgia, cephalalgia, more... Opposite: migraine, tension headache, sinus headache ▸ Words similar to cluster headache ▸ Usage examples for cluster headache ▸ Idioms related to cluster headache ▸ Wikipedia articles (New!) ▸ Words that often appear near cluster headache ▸ Rhymes of cluster headache ▸ Invented words related to cluster headache