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An example use of callus in a speech by a native speaker of american english:
“… milk to it then dip the callus in the …”
meanings of callus
A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
The new formation over the end of a cutting, before it puts out rootlets.
A shining area on the frons of many species of Tabanomorpha (horse flies and relatives).
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.