callus: Meaning and Definition of

cal•lus

1. a hardened or thickened part of the skin; a callosity.
2. a new growth of osseous matter at the ends of a fractured bone, serving to unite them.
1. the tissue that forms over the wounds of plants, protecting the inner tissues and causing healing.
2. a deposit on the perforated area of a sieve tube.
3. (in grasses) a tough swelling at the base of a lemma or palea.

1. to form a callus.

1. to produce a callus or calluses on: Heavy work callused his hands.