/kal"euhs/ , n. , pl. calluses , v. , callused, callusing .
n.
1. Pathol. , Physiol.
a. a hardened or thickened part of the skin; a callosity.
b. a new growth of osseous matter at the ends of a fractured bone, serving to unite them.
2. Also, callose . Bot.
a. the tissue that forms over the wounds of plants, protecting the inner tissues and causing healing.
b. a deposit on the perforated area of a sieve tube.
c. (in grasses) a tough swelling at the base of a lemma or palea.
v.i.
3. to form a callus.
v.t.
4. to produce a callus or calluses on: Heavy work callused his hands.
[ 1555-65; callus, masc. var. of callum; see CALLOUS ]