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

  • n. The condition of being calloused.
  • n. Hardheartedness; insensitivity.
  • n. See callus.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A callus
  • n. A callous demeanour; insensitivity or hardheartedness

from the GNU version of the Collaborative International Dictionary of English

  • n. A hard or thickened spot or protuberance; a hardening and thickening of the skin or bark of a part, eps. as a result of continued pressure or friction.

from The Century Dictionary and Cyclopedia

  • n. The state or quality of being hardened or callous.
  • n. In a concrete sense, any thickened or hardened part on the surface of the human body or that of any animal, such as the hard and often somewhat bony lumps that arise in places exposed to constant pressure and friction, the cicatrized surfaces of old ulcers or wounds, etc., the natural cutaneous thickenings on the buttocks of gibbons and other monkeys, etc.
  • n. In botany, any part of a plant unusually hard.
  • n. In entomology, an elevated, rounded portion of the surface, generally smooth, and paler than the surrounding parts, appearing like a swelling.

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

  • n. devoid of passion or feeling; hardheartedness
  • n. an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)


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

Middle English callosite, from Old French, from Late Latin callōsitās, from Latin callōsus, callous; see callous.



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  • Also used to describe the raised skin on Right Whales that appears white/yellow due to whale lice. Marine scientists use the callosities to identify different whales for tracking and observational studies.

    June 17, 2008