callus

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.

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

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

An area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)

Bony tissue formed during the healing of a fractured bone

(botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchidplant

To form such hardened tissue.

Cause a callus to form on

“The long march had callused his feet”

Form a callus or calluses

“His foot callused”