Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A localized thickening and enlargement of the horny layer of the skin.
  • noun The hard bony tissue that develops around the ends of a fractured bone during healing.
  • noun Undifferentiated tissue that develops on or around an injured or cut plant surface or in tissue culture.
  • noun The hardened, sometimes sharp base of the spikelet of certain grasses.
  • intransitive verb To form or develop such hardened tissue.

from The Century Dictionary.

  • noun In anatomy: Hard skin; a callosity
  • noun A new growth of osseous tissue between and around the extremities of fractured bones, serving to unite them.
  • noun 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.
  • noun In horticulture, the cap or thickening formed over the end of a cutting before it sends forth rootlets.
  • noun 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 the GNU version of the Collaborative International Dictionary of English.

  • noun Same as callosity
  • noun 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.
  • noun (Hort.) The new formation over the end of a cutting, before it puts out rootlets.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
  • noun 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.
  • noun botany The new formation over the end of a cutting, before it puts out rootlets.
  • verb intransitive To form such hardened tissue

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

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

Etymologies

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

[Latin, masculine of callum.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin callum.

Examples

  • The _spikes_ are solitary, 1 to 1-3/4 inch long exserted far above the small spathiform leaf-sheaths, peduncles are capillary and scaberulous, pedicels and joints are somewhat flattened, and have along both the narrow margins long, white, ascending hairs; callus is short with a ring of short white hairs.

    A Handbook of Some South Indian Grasses

  • The _sessile spikelet_ consists of four glumes and contains a complete flower and the callus is short and bearded with long hairs.

    A Handbook of Some South Indian Grasses

  • The _spikelets_ are oblong, 1/8 to 1/5 inch long, the callus is short, hairy with long brown hairs.

    A Handbook of Some South Indian Grasses

  • A callus is a form of hyperkeratosis, or thickened skin, that creates a hard surface.

    Simple Skin Beauty

  • A callus is a form of hyperkeratosis, or thickened skin, that creates a hard surface.

    Simple Skin Beauty

  • A callus is a form of hyperkeratosis, or thickened skin, that creates a hard surface.

    Simple Skin Beauty

  • A callus is an unorganized network of woven bone that forms quickly at a fracture site.

    206 BONES

  • A callus is an unorganized network of woven bone that forms quickly at a fracture site.

    206 BONES

  • A callus is an unorganized network of woven bone that forms quickly at a fracture site.

    206 BONES

  • When the deposition of additional layers of the skin occurs in a diffuse manner it is called a callus or callosity.

    Trusted.MD Network - Empowering Healthcare Relationships

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.

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

    August 8, 2012

  • Do not confuse with callous.

    June 1, 2014