in·​du·​rate | \ ˈin-də-rət How to pronounce indurate (audio) , -dyə-; in-ˈdu̇r-ət, -ˈdyu̇r- \

Definition of indurate

 (Entry 1 of 2)

: physically or morally hardened


in·​du·​rate | \ ˈin-də-ˌrāt How to pronounce indurate (audio) , -dyə- \
indurated; indurating

Definition of indurate (Entry 2 of 2)

transitive verb

1 : to make unfeeling, stubborn, or obdurate
2 : to make hardy : inure
3 : to make hard great heat indurates clay
4 : to establish firmly : confirm

intransitive verb

1 : to grow hard : harden
2 : to become established

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Did You Know?


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" (an archaic word meaning "endurance"), 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."

Examples of indurate in a Sentence

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
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First Known Use of indurate


14th century, in the meaning defined above


1538, in the meaning defined at transitive sense 1

History and Etymology for indurate


Latin induratus, past participle of indurare, from in- + durare to harden, from durus hard — more at during

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The first known use of indurate was in the 14th century

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Cite this Entry

“Indurate.” Dictionary, Merriam-Webster, Accessed 2 Jun. 2020.

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