1. (

• callosity ,
• callus ,

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

2. (

• callus

) bony tissue formed during the healing of a fractured bone ;

3. (

• callus

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