WordReference Random House Unabridged Dictionary of American English © 2025
clus′ter head′ache, [Pathol.]
- Pathologya type of severe recurrent headache associated with dilated carotid arteries and the release of histamine, characterized by sudden attacks of intense pain behind the nostril and eye on one side and accompanied by runny nose, tearing, and flushed skin.
- 1950–55
'cluster headache' also found in these entries (note: many are not synonyms or translations):