"calli" 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)
2. callus
bony tissue formed during the healing of a fractured bone
3. callus
botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
Source: WordNet® (An amazing lexical database of English)
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