1. 胼胝;老茧;硬结
A callus is an unwanted area of thick skin, usually on the palms of your hands or the soles of your feet, which has been caused by something rubbing against it.

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)

Synonym: callosity