| cALL | (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid |
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| cALL | bony tissue formed during the healing of a fractured bone |
| cALL | an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) |
| cALL | form a callus or calluses |
| cALL | cause a callus to form on |