calli
     see callus
see also:
callus 

callus
     n 1: an area of skin that is thick or hard from continual
          pressure or friction as the sole of the foot syn: callosity
     2: bony tissue formed during the healing of a fractured bone
     3: botany an isolated thickening of tissue, especially a
        stiff protuberance on the lip of an orchid
     v 1: cause a callus to form on; "the long march had callused his
          feet"
     2: form a callus or calluses; "his foot callused"
     also: calli pl
see also:
callosity calli