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.
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).
Verb
To form such hardened tissue.
Origin
From Latin callum.
Modern English dictionary
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