Plural of callus; multiple areas of thickened or hardened skin, often on feet or hands from friction or pressure.
Direct Latin plural of 'callus' (hardened skin). Medical terminology retained the Latin plural form rather than adopting the English '-es' ending, showing how scientific language preserves classical forms.
Your body's 'calli' are actually a survival feature—they're your skin's way of protecting you from repeated friction, which is why dancers and construction workers develop them in specific places.
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