| induration [´in·dǝ`rā·shǝn] BIOLOGY The process of hardening, especially by increasing the fibrous elements. GEOLOGY 1. The hardening of a rock material by the application of heat or pressure or by the introduction of a cementing material. 2. A hardened mass formed by such processes. 3. The hardening of a soil horizon by chemical action to form a hardpan. MEDICINE Hardening of a tissue or organ due to an accumulation of blood, inflammation, or neoplastic growth. |