callus

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callus:

see corns and callusescorns and calluses,
thickenings of the outer layer of skin where there is irritation or constant pressure. Corns are cone-shaped with their points protruding into the dermis, or inner layer of skin. They usually have hard, shiny surfaces surrounded by red, painful areas.
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Callus

 

(1) Tissue formed in plants on the surface of a wound (cracks, taps, the bases of cuttings, and areas of concrescence of stock and scion). A callus promotes the healing of wounds. Consisting of thin-walled parenchymal cells, a callus develops when there is cell division of any living tissue of the plant (cambium or phloem) in the peripheral zone of the pith, lying next to the protoxylem. Adventitious roots and buds, particularly with grafting, often develop in the callus. (2) Corpus callosum, an accumulation of callóse that obstructs the sieve plate when the sieve tubes of the phloem age. Use of the term in this sense is obsolete.


Callus

 

a thickening of the horny layer of skin as a result of constant pressure or friction. Calluses usually appear on the palms, soles, and other parts of the body that are in constant contact with tough surfaces. The cracks formed on the surface of a callus may hinder one’s ability to work, and they can also be portals of entry for pyogenic microbes, resulting in such conditions as erysipelatous inflammations and phlegmons.

callus

[′kal·əs]
(botany)
A thickened callose deposit on sieve plates.
A hard tissue that forms over a damaged plant surface.
(medicine)
Hard, thick area on the surface of the skin.

callus

1. 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. an area of bony tissue formed during the healing of a fractured bone
3. 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. Biotechnology a mass of undifferentiated cells produced as the first stage in tissue culture
References in periodicals archive ?
5-)1-2 cm long, green, occasionally suffused with purple, densely pubescent; blades proximal and distal of the same shape, the distal slightly smaller, ovate to ovate-elliptic, (7-)8-14(-18) x (4-)5-7(-8) cm, bullate and slightly fleshy, the base slightly asymmetric, cuneate, the apex acute to acuminate, the margins subentire to slightly serrulate, with 20-40 teeth on each side, teeth of two-size classes, each tooth with a distal callosity, the adaxial surface green, sparsely pubescent, the abaxial surface pale green, densely pubescent with dark or hyaline trichomes, the venation semicraspedodromous, with nine to eleven pairs of secondary veins, irregularly spaced, excurrent to mid-vein, higher order veins reticulated, submarginal vein absent.
From the air and from a boat or ship the callosity looks white and the whales are easily identified by their individual callosity pattern.
gomerae) by the less pronounced callosity of the procursus, the narrower base of the uncus (Fig.