Emily Dickinson Lexicon

CAL'LUS, n. [L. callus, from calleo, to be hard; Sans. kalla, stone.]

Any cutaneous, corneous, or bony hardness, but generally to the new growth of osseous matter between the extremities of fractured bones, serving to unite them; also, a hardness in the skin; a hard, dense, insensible knob on the hands, feet, &c. – Encyc. Coxe.