Etymology

callus

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Today it means: A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use. Full definition →

Latin callum
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The story

  1. Latin · borrowed fromcallum“hard skin”
  2. English todaycallus

Borrowed from Latin callum (“hard skin”). Displaced Old English wearr.

Etymology from Wiktionary, CC BY-SA 4.0.