Cal"lus (?), n. [L. See Callous.]
1. Med. (a)
Same as Callosity
. (b
The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistence, but is ultimately converted into true bone and unites the fragments into a single piece.
2. Hort.
The new formation over the end of a cutting, before it puts out rootlets.
© Webster 1913.