noun, plural cal·lus·es.
- a hardened or thickened part of the skin; a callosity.
- a new growth of osseous matter at the ends of a fractured bone, serving to unite them.
- the tissue that forms over the wounds of plants, protecting the inner tissues and causing healing.
- a deposit on the perforated area of a sieve tube.
- (in grasses) a tough swelling at the base of a lemma or palea.
verb (used without object), cal·lused, cal·lus·ing.
verb (used with object), cal·lused, cal·lus·ing.
Origin of callus
Examples from the Web for callus
Wounds upon plants begin to heal by the formation of loose cellular matter which gives rise to a mass of tissue known as a callus.The Nursery Book|Liberty Hyde Bailey
Later, the nerve may become involved in callus, or be damaged by the pressure of ill-fitting splints.
If the center of the wound falls in, the callus cannot cover it, and an open sore remains.The Apple-Tree|L. H. Bailey
After the bones have united, it will take some weeks to consolidate the uniting material and render the “callus,” or union, firm.
The callus formation indicates the favorable progress of repair, but with the fragments in faulty position.Gunshot Roentgenograms|Clyde S. Ford
noun plural -luses
- a mass of hard protective tissue produced in woody plants at the site of an injury
- an accumulation of callose in the sieve tubes
Word Origin for callus
"hardened skin," 1560s, from Latin callus, variant of callum "hard skin," related to callere "be hard," from PIE root *kal- "hard" (cf. Sanskrit kalika "bud," Old Irish calath "hard," Old Church Slavonic kaliti "to cool, harden").