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[verb in-doo-reyt, -dyoo-; adjective in-doo-rit, -dyoo-; in-doo r-it, -dyoo r-] /verb ˈɪn dʊˌreɪt, -dyʊ-; adjective ˈɪn dʊ rɪt, -dyʊ-; ɪnˈdʊər ɪt, -ˈdyʊər-/
verb (used with object), indurated, indurating.
to make hard; harden, as rock, tissue, etc.:
Cold indurates the soil.
to make callous, stubborn, or unfeeling:
transgressions that indurate the heart.
to inure; accustom:
to indurate oneself to privation and suffering.
to make enduring; confirm; establish:
to indurate custom through practice.
verb (used without object), indurated, indurating.
to become hard; harden.
to become established or confirmed.
hardened; unfeeling; callous; inured.
Origin of indurate
late Middle English
1375-1425; late Middle English indurat < Latin indūrātus past participle of indūrāre to harden. See in-2, dure1, -ate1
Related forms
nonindurated, adjective
semi-indurate, adjective
semi-indurated, adjective
unindurate, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for indurate
Contemporary Examples
Historical Examples
  • Imogen was deaf to their expostulations, and indurate and callous as adamant to their persuasions.

    Imogen William Godwin
  • Underneath these coherent and indurate ledges the most valuble ores exist, but coal and fossils are searched for in vain.

  • Even where there is no plastering, the tattooing may be found to indurate the skin, and to render it less sensible to cold.

    John Rutherford, the White Chief

    George Lillie Craik
  • The drops that trickle within the cavern harden, yet brighten into spars as they indurate.

    Godolphin, Complete Edward Bulwer-Lytton
  • Can we consistently blame her if she becomes callous, when every legal provision directly tends to indurate her sensibilities?

    The History of Prostitution William W. Sanger
  • Stark and indurate like an Adirondack meadow enameled with trap rock, he plodded rigidly on.

  • A thousand years after your body has returned to dust, that piece of indurate will still exist, unchanged, unworn.

    The Long Voyage Carl Richard Jacobi
  • Ganeth-Klae designed it just before he disappeared, using the last lot of indurate in existence.

    The Long Voyage Carl Richard Jacobi
  • He used the last lot of indurate to make that booster, a device which he said would increase our take-off speed.

    The Long Voyage Carl Richard Jacobi
British Dictionary definitions for indurate


verb (ˈɪndjʊˌreɪt)
to make or become hard or callous
to make or become hardy
adjective (ˈɪndjʊrɪt)
hardened, callous, or unfeeling
Derived Forms
induration, noun
indurative, adjective
Word Origin
C16: from Latin indūrāre to make hard; see endure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for indurate

1530s, from Latin induratus, past participle of indurare "to make hard, harden" (see endure). Related: Indurated.

Online Etymology Dictionary, © 2010 Douglas Harper
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