Plural of callus, which is a hardened, thickened area of skin that develops from repeated friction or pressure.
From Latin 'callus' meaning 'hard skin,' related to 'callere' (to be hard or tough). The plural 'callas' reflects Latin pluralization, though modern English often uses 'calluses' as an alternative plural form.
Calluses are your skin's way of protecting itself—they form where there's friction, and they're actually stronger and tougher than regular skin, which is why they show up on guitar players' fingers and dancers' feet!
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