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.
(botany) The new formation over the end of a cutting, before it puts out rootlets.
(intransitive) To form such hardened tissue.
Origin of callus
Latin masculine ofcallum
She'd buried them under the callus she'd grown around her emotions.
Aphidesand may be easily penetrated by certain Fungi such as Peziza, Nectria; and when thus attacked, the repeated conflicts between the cambium and callus, on the one hand, trying to heal over the wound, and the insect or Fungus, on the other, destroying the new tissues as they are formed, results in irregular growths; the still uninjured cambium area goes on thickening the branch, the dead parts, of course, remain unthickened, and the portion in which the Fungus is at work may for the time being grow more rapidly.
Some plants root so freely that they need only pegging down; but in most cases the arrest of the returning sap to form a callus, and ultimately young roots, must be brought about artificially, either by twisting the branch, by splitting it, by girding FIG.
A canker is the result of repeated frustrated attempts on, the part of the callus to heal up a wound.
But the occluding callus is a mass of delicate succulent cells, and offers a dainty morsel to certain insects e.g.