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.
THINK YOU’VE GOT A HANDLE ON THIS US STATE NICKNAME QUIZ?
Origin of callus
OTHER WORDS FROM callusun·cal·lused, adjective
WORDS THAT MAY BE CONFUSED WITH calluscallous, callus
Words nearby callus
Example sentences from the Web for callus
Hertle points out that once a mosaic cell in a graft callus starts to produce roots, shoots and flowers, it could give rise to a new species or subspecies, especially if cell walls open wide enough to admit nuclear genomes.Plant Cells of Different Species Can Swap Organelles|Viviane Callier|January 20, 2021|Quanta Magazine
This callus may form upon any cut surface, or even where the bark has been abraded.American Pomology|J. A. Warder
You can get the callus almost every time, but it is very difficult to secure the development of roots afterwards.
President Morris: How about getting callus by three months, we will say, in storage?
On January 11 the cambium ring at the lower end of the cuttings had begun to callus.
The butternut and black walnut hardly showed any callus at all after keeping the sphagnum wet as long as my men would do it.
British Dictionary definitions for callus
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