[kley-vuhs, klah-]
noun, plural clavi [kley-vahy, -vee] .
Psychiatry. an intense headache in which the pain is likened to one that would be produced by a sharp object driven into the skull.
(in ancient Rome) a vertical stripe or band of purple worn on the tunic by senators and equites.
Entomology, clavola.

1800–10; < Latin: literally, nail; akin to claudere to close Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

clavus cla·vus (klā'vəs, klä'-)
n. pl. cla·vi (-vī')

  1. See corn.

  2. A condition resulting from healing of a granuloma of the foot in yaws, in which a core falls out, leaving an erosion.

The American Heritage® Stedman's Medical Dictionary
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