1.an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)
2.bony tissue formed during the healing of a fractured bone
3.(botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
1.cause a callus to form on;
The long march had callused his feet
2.form a callus or calluses;
His foot callused