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callus

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(kal′əs)

noun pl. calluses

a hardened, thickened place on the skin
the hard substance that forms at the break in a fractured bone and serves to reunite the parts
a disorganized mass of cells that develops over cuts or wounds on plants, as at the ends of stem or leaf cuttings

Origin: L, var. of callum, hard skin

intransitive verb, transitive verb

to develop or cause to develop a callus

See callus in American Heritage Dictionary 4

noun 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.
Botany
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 floret of certain grasses.

intransitive verb cal·lused, cal·lus·ing, cal·lus·es

To form or develop such hardened tissue. See Usage Note at callous.

Origin:

Origin: Latin

Origin: , masculine of callum

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