1. a thickened and hardened area of skin that develops from repeated friction or pressure
2. hard tissue that forms around a broken bone during healing
Usage: medical

1. to develop a callus or become hardened

Examples

• The guitarist developed calluses on his fingertips from playing daily.
• She had a painful callus on her heel from wearing tight shoes.
• The doctor examined the callus forming around the fractured bone.
• Years of manual labor had caused his hands to callus.
• The runner’s feet began to callus after months of training.
• A thick callus protected her palm from the rope burn.
• The broken bone was healing well as new callus tissue formed.