Definitions
1.nounA hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
2.nounThe 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.nounThe new formation over the end of a cutting, before it puts out rootlets.
4.nounA shining area on the frons of many species of Tabanomorpha (horse flies and relatives).
5.verbTo form such hardened tissue.