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Webster 1913 Edition

Callus

Cal′lus

(kăl′lŭs)
,
Noun.
[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 1828 Edition

Callus

CALLUS

,
Noun.
Any cutaneous, corneous, or bony hardness, but generally the new growth of osseous matter between the extremities of fractured bones, serving to unite them; also a hardness in the skin; a hard, dense, insensible knob on the hands, feet, &c.

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