water balance

noun

: the ratio between the water assimilated into the body and that lost from the body
also : the condition of the body when this ratio approximates equilibrium

Examples of water balance 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.
Electrolytes are charged minerals that help the body maintain hydration (water balance) and other functions.7 Other electrolytes include sodium (salt), magnesium, and calcium. Amber J. Tresca, Verywell Health, 28 Apr. 2026 And over the next few decades, researchers would continue to home in on salt and water balance as the problem in CF patients. Courtney Crowder, USA Today, 10 Apr. 2026 In the almost two decades since that girl's critical checkup, Welsh focused his experiments on salt and water balance, which was long thought to hold the answer to the enigmatic, confusing mix of CF symptoms. Courtney Crowder, Des Moines Register, 15 Mar. 2026 Metro has a strong buffer against shortages in its water supplies, meaning the district could stay in a positive water balance, and potentially even continue building its savings, in an unmitigated static reduction scenario. Austin Corona, AZCentral.com, 6 Nov. 2025 In hydrology, the most important equation is the water balance equation. Quanta Magazine, 10 July 2025

Word History

First Known Use

1888, in the meaning defined above

Time Traveler
The first known use of water balance was in 1888

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Cite this Entry

“Water balance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20balance. Accessed 23 May. 2026.

Medical Definition

water balance

noun
: the ratio between the water assimilated into the body and that lost from the body
also : the condition of the body when this ratio approximates unity
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