Source : Webster's Revised Unabridged Dictionary (1913)

Induration \In`du*ra"tion\, n. [Cf. F. induration, L. induratio
   hardness of heart.]
   1. The act of hardening, or the process of growing hard.

   2. State of being indurated, or of having become hard.

   3. Hardness of character, manner, sensibility, etc.;
      obduracy; stiffness; want of pliancy or feeling.

            A certain induration of character had arisen from
            long habits of business.              --Coleridge.

Source : WordNet®

induration
     n : any pathological hardening or thickening of tissue [syn: {sclerosis}]