callus
名词 callus:
an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)
同义词:callosity
bony tissue formed during the healing of a fractured bone
(botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
动词 callus:
cause a callus to form on
form a callus or calluses