The American Heritage® Dictionary of the English Language, 4th Edition
n. The quality or condition of being hardened.
n. The act or process of becoming hardened.
n. Pathology The hardening of a normally soft tissue or organ, especially the skin, because of inflammation, infiltration of a neoplasm, or an accumulation of blood.
n. Hardening of an area of the body as a reaction to inflammation, hyperemia, or neoplastic infiltration.
n. An area or part of the body that has undergone such a reaction. Most often this term is used to describe dermatologic findings.
the GNU version of the Collaborative International Dictionary of English
n. The act of hardening, or the process of growing hard.
n. State of being indurated, or of having become hard.
n. Hardness of character, manner, sensibility, etc.; obduracy; stiffness; lack of pliancy or feeling.
The Century Dictionary and Cyclopedia
n. The act of hardening, or the process of growing hard; the state of being indurated or of having become hard.
n. Hardness of heart; insensibility; obduracy; want of pliancy.
n. An indurated, hardened, or callous part.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any pathological hardening or thickening of tissue
Word Usage
"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."