Definitions from Wiktionary (callus)

▸ noun:  A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
▸ noun:  The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece.
▸ noun:  (botany) The new formation over the end of a cutting, before it puts out rootlets.
▸ noun:  (botany) In orchids, a fleshy outgrowth from the labellum.
▸ noun:  (botany) In grasses, a hardened extension from the base of a floret, which may or may not elongate and is often covered in hairs or bristles.
▸ noun:  (entomology) A shining area on the frons of many species of Tabanomorpha (horse flies and relatives).
▸ verb:  (intransitive) To form such hardened tissue.
▸ Also see callus

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