callouses

/K AE1 L AH0 S IH0 Z/
noun
  1. 1

    A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.

  2. 2

    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.

  3. 3

    The new formation over the end of a cutting, before it puts out rootlets.

  4. 4

    A shining area on the frons of many species of Tabanomorpha (horse flies and relatives).

Source: https://en.wiktionary.org/wiki/callous, https://en.wiktionary.org/wiki/callouses, https://en.wiktionary.org/wiki/callus