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[dih-loot, dahy-; adjective dahy-loot] /dɪˈlut, daɪ-; adjective ˈdaɪ lut/
verb (used with object), diluted, diluting.
to make (a liquid) thinner or weaker by the addition of water or the like.
to make fainter, as a color.
to reduce the strength, force, or efficiency of by admixture.
verb (used without object), diluted, diluting.
to become diluted.
reduced in strength, as a chemical by admixture; weak:
a dilute solution.
Origin of dilute
1545-55; < Latin dīlūtus washed away, dissolved (past participle of dīluere), equivalent to dī- di-2 + -lūtus, combining form of lautus (lav(ere) to wash + -tus past participle suffix)
Related forms
diluter, dilutor, noun
dilutive, adjective
antidilutive, adjective
overdilute, verb, overdiluted, overdiluting.
undilute, adjective
undiluted, adjective
undiluting, adjective
Can be confused
dilate, dilute.
3. weaken, temper, mitigate, diminish. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for undiluted
Contemporary Examples
Historical Examples
  • In modern practice, however, undiluted latex is usually diluted to a standard which may vary on different estates from 11⁄4 lbs.

  • Christmas Day was a day of undiluted triumph for Father Letheby.

    My New Curate P.A. Sheehan
  • Dinner, owing to Avery's determined steering of the conversation, was eaten to the accompaniment of undiluted shop.

    Sinister Street, vol. 2 Compton Mackenzie
  • He poured a full glass, undiluted, for himself, and held it up to the light.

    Turn About Eleanor Ethel M. Kelley
  • Men turned involuntarily to look after her, not altogether in undiluted admiration.

    The Black Bag Louis Joseph Vance
  • This is often due to the fact that it is taken raw and undiluted.

  • He was looking forward to it now with feelings of undiluted satisfaction.

    The Double Four E. Phillips Oppenheim
  • Your grandfather was a Standish; your ancestry was undiluted Puritan.

    Satan Sanderson Hallie Erminie Rives
British Dictionary definitions for undiluted


not diluted with water or any other liquid: undiluted fruit juice
not moderated or qualified in any way: expressing undiluted pleasure


to make or become less concentrated, esp by adding water or a thinner
to make or become weaker in force, effect, etc: he diluted his story
  1. (of a solution, suspension, mixture, etc) having a low concentration or a concentration that has been reduced by admixture
  2. (of a substance) present in solution, esp a weak solution in water: dilute acetic acid
Derived Forms
dilutee, noun
diluter, noun
Word Origin
C16: from Latin dīluere, from dis- apart + -luere, from lavāre to wash
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 undiluted

1756, from un- (1) "not" + past participle of dilute.



1550s, from Latin dilutus, past participle of diluere "dissolve, wash away, dilute," from dis- "apart" + -luere, comb. form of lavere "to wash" (see lave). Related: Diluted; diluting. As an adjective from c.1600.

Online Etymology Dictionary, © 2010 Douglas Harper
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undiluted in Medicine

dilute di·lute (dī-lōōt', dĭ-)
v. di·lut·ed, di·lut·ing, di·lutes
To reduce a solution or mixture in concentration, quality, strength, or purity, as by adding water. adj.
Thinned or weakened by diluting.

di·lu'tive adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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