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