Entry 5 senses · 3 variants Webster, 1913 Indurate · In·du·rate · IPA /ɪnˈdjʊɹeɪt/ a. v. t. v. i. 01 a. Hardened; not soft; indurated. 1. Hardened; not soft; indurated. 2. Without sensibility; unfeeling; obdurate. 02 v. t. To make hard; as, extreme heat indurates clay; some fossils are indurated by exposure to the air. imp. & p. p. Indurated; p. pr. & vb. n. Indurating 1. To make hard; as, extreme heat indurates clay; some fossils are indurated by exposure to the air. 2. To make unfeeling; to deprive of sensibility; to render obdurate. 03 v. i. To grow hard; to harden, or become hard; as, clay indurates by drying, and by heat. 1. To grow hard; to harden, or become hard; as, clay indurates by drying, and by heat.