callus
C2Substantiv/US /kˈæləs/ KĂL-əs; UK /kˈæləs/ KĂL-əs/
Same as (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.
