Source : WordNet®

calli
     See {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)]