callus is a topic covered in the Taber's Medical Dictionary.

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(kal′ŭs )

[L., hardened skin]

1. A circumscribed thickening and hypertrophy of the horny layer of the skin. It may be oval or elongated, gray or brown, slightly elevated, with a smooth burnished surface. It appears on the flexor surfaces of hands and feet and is caused by friction, pressure, or other irritation.

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CALLUS (on the weight-bearing portion of the foot)
SYN: SEE: callosity

Salicylic acid or careful shaving will remove the callosity temporarily. Removal is made permanent only by elimination of the cause.

2. The osseous material woven between the ends of a fractured bone that is ultimately replaced by true bone during healing.
SEE: porosis

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