clavus

[ kley-vuhs, klah- ]

/ ˈkleɪ vəs, ˈklɑ- /

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noun, plural cla·vi

[kley-vahy, -vee]. /ˈkleɪ vaɪ, -vi/.

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.

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Origin of clavus

1800–10; <Latin: literally, nail; akin to claudere to close

They appear to be the origin of the “clavus” or nail-headed pattern woven into silks in the Palace of the Cæsars.
Needlework As Art|Marian Alford
I shall discuss the Latin Clavus and the Chrysoclavus amongst ecclesiastical embroideries, pp. 308, 336 (post).
Needlework As Art|Marian Alford
Claval suture: Hemiptera; at the base of hemelytra, separating the clavus.
Explanation of Terms Used in Entomology|John. B. Smith
Hysterical patients describe a sensation as if a nail were being driven into the forehead—the so-called clavus hystericus.
Psychotherapy|James J. Walsh

Some of the worst cases of clavus, probably, that have ever been seen were developed in the old days of phlebotomy.
Neuralgia and the Diseases that Resemble it|Francis E. Anstie