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callus noun

  /ˈkæləs/
  • A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
  • The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece.
 hård hud, valk
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