"callus" in the noun sense
1. callosity, callus
an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)
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
"callus" in the verb sense
cause a callus to form on
"The long march had callused his feet"
form a callus or calluses
"His foot callused"
Source: WordNet® (An amazing lexical database of English)
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