hydrofoil

noun
hy·​dro·​foil | \ ˈhī-drə-ˌfȯi(-ə)l How to pronounce hydrofoil (audio) \

Definition of hydrofoil

1 : a body similar to an airfoil but designed for action in or on water
2 : a motorboat that has metal plates or fins attached by struts fore and aft for lifting the hull clear of the water as speed is attained

Illustration of hydrofoil

Illustration of hydrofoil

hydrofoil 2

Examples of hydrofoil in a Sentence

Recent Examples on the Web During a bluebird September morning on Tahoe’s West Shore, Cook explained the tricky physics of riding an efoil, or electric hydrofoil, a new brand of personal watercraft popping up on waterways around the world. Gregory Thomas, SFChronicle.com, "This $12,000 electric surfboard is the latest craze on Lake Tahoe," 8 Oct. 2020 Boston University undergrad Anna Weis has qualified for the Olympic sailing regatta with partner Riley Gibbs in the Nacra 17 (hydrofoil) mixed event. John Powers, BostonGlobe.com, "Three women’s berths at stake at US marathon trials," 22 Feb. 2020 The new 75-foot yachts, which rise out of the water on hydrofoils, will be sailed by 11 crew and could reach speeds of up to 50 knots. Rob Hodgetts, CNN, "America's Cup: Revolutionary 'flying' yachts take Auld Mug into new realm," 23 Dec. 2019 The vessels of the America's Cup deploy hydrofoils to reach ridiculous speeds. Kyle Mizokami, Popular Mechanics, "The U.S. Navy Has a Secret Hydrofoil Project," 10 Apr. 2019 From our base in the small city of Salerno, travel by hydrofoil to Capri. National Geographic, "Italy and Greece Expedition: Empires of the Mediterranean," 10 Sep. 2019 The hydrofoil heaves in response to tidal currents to turn the energy of tides into electrical current. Shweta Narayan, Smithsonian, "How Engineers of New Energy Technology Are Taking Cues From Nature," 31 Aug. 2019 From our base in the small city of Salerno, travel by hydrofoil to Capri. National Geographic, "Italy and Greece Expedition: Empires of the Mediterranean," 10 Sep. 2019 An oscillating hydrofoil resembles an aircraft wing, but with a symmetrical elliptical cross section that allows for energy harvesting as the tide ebbs and flows. Shweta Narayan, Smithsonian, "How Engineers of New Energy Technology Are Taking Cues From Nature," 31 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hydrofoil.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of hydrofoil

1919, in the meaning defined at sense 1

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Time Traveler for hydrofoil

Time Traveler

The first known use of hydrofoil was in 1919

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Last Updated

14 Oct 2020

Cite this Entry

“Hydrofoil.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrofoil. Accessed 4 Dec. 2020.

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More Definitions for hydrofoil

hydrofoil

noun
How to pronounce hydrofoil (audio)

English Language Learners Definition of hydrofoil

: a very fast boat that rises partly out of the water when moving at high speeds

More from Merriam-Webster on hydrofoil

Thesaurus: All synonyms and antonyms for hydrofoil

Britannica.com: Encyclopedia article about hydrofoil

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