Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A localized thickening and enlargement of the horny layer of the skin. Also called callosity.
  • n. The hard bony tissue that develops around the ends of a fractured bone during healing.
  • n. Botany Undifferentiated tissue that develops on or around an injured or cut plant surface or in tissue culture.
  • n. Botany The hardened, sometimes sharp base of the floret of certain grasses.
  • intransitive v. To form or develop such hardened tissue. See Usage Note at callous.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
  • n. The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece.
  • n. The new formation over the end of a cutting, before it puts out rootlets.
  • v. To form such hardened tissue

from the GNU version of the Collaborative International Dictionary of English

  • n.
  • n. Same as callosity
  • n. The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistence, but is ultimately converted into true bone and unites the fragments into a single piece.
  • n. The new formation over the end of a cutting, before it puts out rootlets.

from The Century Dictionary and Cyclopedia

  • n. In anatomy: Hard skin; a callosity
  • n. A new growth of osseous tissue between and around the extremities of fractured bones, serving to unite them.
  • n. In botany, any unusually hard excrescence upon a plant; also, the thickening of the substance of the perforated septa between sieve-cells, and the close cellular structure which is formed over wounds, by which the inner tissues are protected and healing is effected.
  • n. In horticulture, the cap or thickening formed over the end of a cutting before it sends forth rootlets.
  • n. In conchology, a callosity or indurated thickening of a shell by the deposit of some hard substance different from the rest of the shell.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)
  • n. bony tissue formed during the healing of a fractured bone
  • n. (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
  • v. cause a callus to form on
  • v. form a callus or calluses

Etymologies

Latin, masculine of callum.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin callum. (Wiktionary)

Examples

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Comments

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  • Do not confuse with callous.

    June 1, 2014

  • Everything grows to callus gradually, Stanley Yelnats. (From the Movie Holes)

    August 8, 2012