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[Log In](https://www.merriam-webster.com/login) # hydrostatic ## [adjective](https://www.merriam-webster.com/dictionary/adjective) hy·​dro·​stat·​ic [ˌhī-drə-ˈsta-tik ](https://www.merriam-webster.com/dictionary/hydrostatic?pronunciation&lang=en_us&dir=h&file=hydros07 "How to pronounce hydrostatic (audio)") **:** of or relating to fluids at rest or to the pressures they exert or transmit compare [hydrokinetic](https://www.merriam-webster.com/dictionary/hydrokinetic) hydrostatically [ˌhī-drə-ˈsta-ti-k(ə-)lē ](https://www.merriam-webster.com/dictionary/hydrostatic?pronunciation&lang=en_us&dir=h&file=hydros08 "How to pronounce hydrostatic (audio)") adverb ## Examples of *hydrostatic* in a Sentence Recent Examples on the Web Examples are automatically compiled from online sources to show current usage. [Read More](https://www.merriam-webster.com/dictionary/hydrostatic) Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. [Send us feedback](https://docs.google.com/forms/d/1GAQr3Kn1cURCVHUA82hAga1Wv8DCH0IuqDLRUrOpN7M/viewform?ts=63f4f653&entry.1515682415=https://www.merriam-webster.com/dictionary%2Fhydrostatic). That rating comes from the *hydrostatic* head pressure test—also known as the water column test—which assesses how waterproof a fabric is by using high pressure to push water through. —Adam Trenkamp, *Outside*, 27 Dec. 2025 Reducing the weight of ice sheets and glaciers in the Arctic has been found to decrease *hydrostatic* pressure on subglacial hydrate reservoirs, which can then enhance subglacial flux and methane discharge on the coast, according to the paper. —Julia Jacobo, *ABC News*, 11 Oct. 2025 The *hydrostatic* head for the X-mid is 3500, which is plenty to keep you dry. —Scott Gilbertson, *Wired News*, 26 Sep. 2025 Inspections include internal and external examinations, *hydrostatic* testing, and a follow-up functional test after remediation. —Mayu Saini, *Sourcing Journal*, 15 Aug. 2025 [See All Example Sentences for *hydrostatic*](https://www.merriam-webster.com/sentences/hydrostatic) ## Word History Etymology probably from New Latin *hydrostaticus*, from *hydr-* + *staticus* static First Known Use 1666, in the meaning defined [above](https://www.merriam-webster.com/dictionary/hydrostatic#h1) Time Traveler The first known use of *hydrostatic* was in 1666 [See more words from the same year](https://www.merriam-webster.com/time-traveler/1666?src=defrecirc-timetraveler-etycard) ## Rhymes for *hydrostatic* - [achromatic](https://www.merriam-webster.com/dictionary/achromatic) - [acrobatic](https://www.merriam-webster.com/dictionary/acrobatic) - [adriatic](https://www.merriam-webster.com/dictionary/adriatic) - [aliphatic](https://www.merriam-webster.com/dictionary/aliphatic) - [antistatic](https://www.merriam-webster.com/dictionary/antistatic) - [aromatic](https://www.merriam-webster.com/dictionary/aromatic) - [astigmatic](https://www.merriam-webster.com/dictionary/astigmatic) - [autocratic](https://www.merriam-webster.com/dictionary/autocratic) - [automatic](https://www.merriam-webster.com/dictionary/automatic) - [bureaucratic](https://www.merriam-webster.com/dictionary/bureaucratic) - [charismatic](https://www.merriam-webster.com/dictionary/charismatic) - [cholestatic](https://www.merriam-webster.com/dictionary/cholestatic) [See All Rhymes for *hydrostatic*](https://www.merriam-webster.com/rhymes/perfect/hydrostatic) ## Browse Nearby Words [hydrospire](https://www.merriam-webster.com/dictionary/hydrospire) hydrostatic [hydrostatic arch](https://www.merriam-webster.com/dictionary/hydrostatic%20arch) [See all Nearby Words](https://www.merriam-webster.com/browse/dictionary/h/42) ## Cite this Entry Style “Hydrostatic.” *Merriam-Webster.com Dictionary*, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrostatic. Accessed 15 Mar. 2026. [Copy Citation](https://www.merriam-webster.com/dictionary/hydrostatic) ## Medical Definition hydrostatic adjective hy·​dro·​stat·​ic [\-ˈstat-ik ](https://www.merriam-webster.com/dictionary/hydrostatic?pronunciation&lang=en_us&dir=h&file=hydros07 "How to pronounce hydrostatic (audio)") **:** of or relating to fluids at rest or to the pressures they exert or transmit compare [hydrokinetic](https://www.merriam-webster.com/dictionary/hydrokinetic#medicalDictionary) hydrostatically [\-i-k(ə-)lē ](https://www.merriam-webster.com/dictionary/hydrostatic?pronunciation&lang=en_us&dir=h&file=hydros08 "How to pronounce hydrostatic (audio)") adverb Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free\! 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**:** of or relating to fluids at rest or to the pressures they exert or transmit compare [hydrokinetic](https://www.merriam-webster.com/dictionary/hydrokinetic) hydrostatically adverb Examples of *hydrostatic* in a Sentence Recent Examples on the Web Examples are automatically compiled from online sources to show current usage. [Read More](https://www.merriam-webster.com/dictionary/hydrostatic) Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. [Send us feedback](https://docs.google.com/forms/d/1GAQr3Kn1cURCVHUA82hAga1Wv8DCH0IuqDLRUrOpN7M/viewform?ts=63f4f653&entry.1515682415=https://www.merriam-webster.com/dictionary%2Fhydrostatic). That rating comes from the *hydrostatic* head pressure test—also known as the water column test—which assesses how waterproof a fabric is by using high pressure to push water through. —Adam Trenkamp, *Outside*, 27 Dec. 2025 Reducing the weight of ice sheets and glaciers in the Arctic has been found to decrease *hydrostatic* pressure on subglacial hydrate reservoirs, which can then enhance subglacial flux and methane discharge on the coast, according to the paper. —Julia Jacobo, *ABC News*, 11 Oct. 2025 The *hydrostatic* head for the X-mid is 3500, which is plenty to keep you dry. —Scott Gilbertson, *Wired News*, 26 Sep. 2025 Inspections include internal and external examinations, *hydrostatic* testing, and a follow-up functional test after remediation. —Mayu Saini, *Sourcing Journal*, 15 Aug. 2025 [See All Example Sentences for *hydrostatic*](https://www.merriam-webster.com/sentences/hydrostatic) Word History Etymology probably from New Latin *hydrostaticus*, from *hydr-* + *staticus* static First Known Use 1666, in the meaning defined [above](https://www.merriam-webster.com/dictionary/hydrostatic#h1) Time Traveler The first known use of *hydrostatic* was in 1666 Browse Nearby Words Cite this Entry Style “Hydrostatic.” *Merriam-Webster.com Dictionary*, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrostatic. Accessed 15 Mar. 2026. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free\! [Merriam-Webster unabridged](https://premium.britannica.com/mw-unabridged/?utm_source=mw&utm_medium=inline-def&utm_campaign=evergreen) More from Merriam-Webster