in·du·rate (ĭndə-rāt′, -dyə-)
v. in·du·rat·ed, in·du·rat·ing, in·du·rates
1. To make hard; harden: soil that had been indurated by extremes of climate.
2. To inure, as to hardship or ridicule.
3. To make callous or obdurate: "It is the curse of revolutionary calamities to indurate the heart" (Helen Maria Williams).
1. To grow hard; harden.
2. To become firmly fixed or established.
adj. (ĭnd-rĭt, -dyə-)
Hardened; obstinate; unfeeling.
[Latin indūrāre, indūrāt- : in-, intensive pref.; see IN-2 + dūrus, hard; see deru- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.