dehydration

noun

de·​hy·​dra·​tion ˌdē-ˌhī-ˈdrā-shən How to pronounce dehydration (audio)
Synonyms of dehydrationnext
: the process of dehydrating
especially : an abnormal depletion of body fluids

Examples of dehydration in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Experts recommend oral rehydration fluids rather than sports drinks to replace important nutrients and minerals lost to vomiting and diarrhea — although drinks like Gatorade may help with mild dehydration. NBC news, 29 May 2026 Of the 54 hospitalized, 47 (87 percent) developed a complication of measles, including 39 (72 percent) who developed pneumonia, 25 (46 percent) had dehydration, and 21 (39 percent) developed diarrhea. Beth Mole, ArsTechnica, 29 May 2026 Ensure children drink plenty of water, formula or breast milk or Pedialyte to prevent dehydration. Don Sweeney, Sacbee.com, 27 May 2026 In February 2026, he was hospitalized for infection and dehydration while on a family vacation in Tenerife. Meredith Kile, PEOPLE, 27 May 2026 See All Example Sentences for dehydration

Word History

First Known Use

1840, in the meaning defined above

Time Traveler
The first known use of dehydration was in 1840

Browse Nearby Words

Cite this Entry

“Dehydration.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dehydration. Accessed 2 Jun. 2026.

Medical Definition

dehydration

noun
de·​hy·​dra·​tion ˌdē-hī-ˈdrā-shən How to pronounce dehydration (audio)
: the process of dehydrating
especially : an abnormal depletion of body fluids
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