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

  • noun The quality or condition of being hardened.
  • noun The act or process of becoming hardened.
  • noun The hardening of a normally soft tissue or organ, especially the skin, due to inflammation, infiltration of a neoplasm, or accumulation of blood.

from The Century Dictionary.

  • noun The act of hardening, or the process of growing hard; the state of being indurated or of having become hard.
  • noun Hardness of heart; insensibility; obduracy; want of pliancy.
  • noun An indurated, hardened, or callous part.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The act of hardening, or the process of growing hard.
  • noun State of being indurated, or of having become hard.
  • noun Hardness of character, manner, sensibility, etc.; obduracy; stiffness; lack of pliancy or feeling.

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

  • noun Hardness.
  • noun Process of becoming hard.
  • noun medicine Hardening of an area of the body as a reaction to inflammation, hyperemia, or neoplastic infiltration.
  • noun medicine An area or part of the body that has undergone such a reaction. Most often this term is used to describe dermatologic findings.

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

  • noun any pathological hardening or thickening of tissue


from Wiktionary, Creative Commons Attribution/Share-Alike License

Via French from Latin indurare ‘make hard’, from in- + durus ‘hard’.


  • It [sic] steatites for instance I have specimens of every degree of induration from the hardness of soap to the most compact polished jasper and they illustrate the fact of jaspers being indurated steatites, so clearly and fully that I cannot find in my heart to keep them asunder.

    The Creation of Color in Eighteenth-Century Europe

  • The level of induration in the nearby sediments increases toward the trap rock.

    Ecoregions of New Jersey (EPA)

  • Other injection site reactions are: pain or tenderness, erythema, inflammation, skin discoloration, induration, a mass or lump; and hypersensitivity reactions including puritus and urticaria.

    Influenza shots? No thank you!

  • He had a severe local reaction (massive swelling of the leg with induration) and the GP was called out and witnessed this.

    On Thursday, the Legg report will be published along with...

  • For when the spirit, or moisture turned to spirit, has escaped from some porous body (as wood, bone, parchment, and the like), then the grosser parts are with stronger effort drawn and collected together; whence ensues induration or desiccation, which I take to be owing not so much to the motion of connection to prevent a vacuum as to this motion of friendship and union.

    The New Organon

  • Lastly, I must not omit that meeting of the parts of bodies which is the chief cause of induration and desiccation.

    The New Organon

  • But this they make by the refrigeration and condensation of the body, changing, as it were, by induration the spirit, which of vegetative is made animal.

    Essays and Miscellanies

  • But fire is no constant cause either of induration or colliquation; so then the physical causes are but the efficient and the matter.

    The Advancement of Learning

  • Fire is the cause of induration, but respective to clay; fire is the cause of colliquation, but respective to wax.

    The Advancement of Learning

  • Local reactions: induration and painful reaction at injection site.

    Chapter 4


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