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.