In anatomy, a corn or callus on the foot; in botany, a small nail-like structure; also refers to a stripe or band in Roman clothing.
From Latin clavus (nail, spike, or callus). The word originally meant a nail or spike, and the medical meaning evolved from the idea of a hard, nail-like growth on skin.
Romans wore a clavus—a vertical purple stripe on their tunics—that symbolized rank and citizenship. The same Latin word 'clavus' referred to both the decorative stripe AND actual nails, showing how Romans saw these as similar striped or linear forms!
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