calli

(noun) an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot). Synonyms: callosity, callus.

(noun) bony tissue formed during the healing of a fractured bone. Synonyms: callus.

(noun) (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid. Synonyms: callus.