Indurate is a hard word—in more than one way. Not only is it fairly uncommon in modern usage, but it also can be traced back to Latin durare, meaning "to harden." Durare can mean "to endure" as well, and appropriately indurate is a word that has lasted many years—it has been a part of the English language since the 14th century. Durare is also the root of other durable English words, including during, endure, duration, durance, and even durable itself. In addition, indurate can be a verb meaning "to make or grow hard," "to make unfeeling, stubborn, or obdurate," and "to establish firmly."
Adjective an indurate heart that admits no love or mercy Verb clay that had been indurated by long exposure to the summer sun such a brutal upbringing could only callous his soul and indurate his heart to the suffering of others
Word History
Etymology
Verb
Latin induratus, past participle of indurare, from in- + durare to harden, from durus hard — more at during