- callus⇄callus, noun, pl.-luses,verb.
- callus⇄noun Also, callosity.1. a hard, thickened place on the skin.
2. a new growth to unite the ends of a broken bone.
3a. a substance that grows over the wounds of plants.
b. the thickening of the substance of the perforated septa (divid - callus⇄v.i. to form or develop a callus.
- callus⇄v.t. to form or develop a callus on.