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Latin word clavus comes from Proto-Indo-European *(s)kel-
*(s)kel- (Proto-Indo-European)
*(s)kleh₂w- (Proto-Indo-European)
*klāwos (Proto-Italic)
clavus (Latin)
A nail (metal spike). Callus, wart, tumor. Helm (of a boat). Purple stripe on the tunic. Rudder.