Also found in: Thesaurus, Medical, Legal, Idioms, Encyclopedia, Wikipedia.
n. pl. cal·lus·es
a. A localized thickening and enlargement of the horny layer of the skin. Also called callosity.
b. The hard bony tissue that develops around the ends of a fractured bone during healing.
a. Undifferentiated tissue that develops on or around an injured or cut plant surface or in tissue culture.
b. The hardened, sometimes sharp base of the spikelet of certain grasses.
intr.v. cal·lused, cal·lus·ing, cal·lus·es
To form or develop such hardened tissue. See Usage Note at callous.
[Latin, masculine of callum.]
n, pl -luses
1. (Pathology) Also called: callosity an area of skin that is hard or thick, esp on the palm of the hand or sole of the foot, as from continual friction or pressure
2. (Pathology) an area of bony tissue formed during the healing of a fractured bone
3. (Botany) botany
a. a mass of hard protective tissue produced in woody plants at the site of an injury
b. an accumulation of callose in the sieve tubes
4. (Geological Science) biotechnology a mass of undifferentiated cells produced as the first stage in tissue culture
(Botany) to produce or cause to produce a callus
[C16: from Latin, variant of callum hardened skin]
n., pl. -lus•es, n.
a. a hardened or thickened part of the skin; callosity.
b. a new growth of osseous matter at the ends of a fractured bone, serving to unite them.
2. Also, callose. the tissue that forms over the wounds of plants, protecting the inner tissues and causing healing.v.i.
3. to form a callus.v.t.
4. to produce a callus or calluses on.
[1555–65; < Latin]
An area of the skin that has become hardened and thick, usually because of prolonged pressure or rubbing.
Past participle: callused
The healing tissue produced by plants to cover a wound resulting from a cut or other physical damage.
Switch to new thesaurus
|Noun||1.||callus - an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)|
hardening - abnormal hardening or thickening of tissue
|2.||callus - bony tissue formed during the healing of a fractured bone|
chestnut - a small horny callus on the inner surface of a horse's leg
|3.||callus - (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid|
|Verb||1.||callus - cause a callus to form on; "The long march had callused his feet"|
|2.||callus - form a callus or calluses; "His foot callused"|