/klay"veuhs, klah"-/ , n. , pl. clavi /-vuy, -vee/ .
1. Psychiatry. an intense headache in which the pain is likened to one that would be produced by a sharp object driven into the skull.
2. (in ancient Rome) a vertical stripe or band of purple worn on the tunic by senators and equites.
3. Entomol. clavola.
[ 1800-10; claudere to close ]