definition of
callus

[1] #1 callus n. [callosity] an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot). wn

[2] #2 callus v. cause a callus to form on; "The long march had callused his feet". wn

[3] #3 callus n. bony tissue formed during the healing of a fractured bone. wn

[4] #4 callus v. form a callus or calluses; "His foot callused". wn

[5] #5 callus n. (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid. wn