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• darcy
  darcy

  noun

  a unit of permeability, representing the flow, at 1 atmosphere, of 1 cubic centimeter of fluid with 1 centipoise viscosity in 1 second through a 1-square-centimeter cross section of porous medium 1 centimeter long.
• Darcy
  Darcy

  noun

  a male given name.
• Darcy,
  Darcy,

  French engineer who formulated the law (now named for him) governing the rate at which a fluid flows through a permeable medium. The darcy unit, used to measure the permeability of porous substances, is also named after him.

darcy

¹ American  

[dahr-see] / ˈdɑr si /

noun

• darcies
  plural

1. Physics. a unit of permeability, representing the flow, at 1 atmosphere, of 1 cubic centimeter of fluid with 1 centipoise viscosity in 1 second through a 1-square-centimeter cross section of porous medium 1 centimeter long.

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Darcy ² American  

[dahr-see] / ˈdɑr si /

noun

1. a male given name.

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Darcy ¹ British  

/ ˈdɑːsɪ /

noun

1. ( James ) Les ( lie ). 1895–1917, Australian boxer and folk hero, who lost only five professional fights and was never knocked out, considered a martyr after his death from septicaemia during a tour of the United States

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darcy ² British  

/ ˈdɑːsɪ /

noun

1.  D.  geology a unit expressing the permeability coefficient of rock

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Darcy, ¹ Scientific  

1. French engineer who formulated the law (now named for him) governing the rate at which a fluid flows through a permeable medium. The darcy unit, used to measure the permeability of porous substances, is also named after him.

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darcy ² Scientific  

/ där′sē′ /

1. A unit used to measure the permeability of porous substances such as soil. One darcy is equal to the passage of 1 cubic centimeter of fluid having a viscosity of 1 centipoise for 1 second under the pressure of 1 atmosphere through a medium having a volume of 1 cubic centimeter.

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Other Word Forms

Noun Inflected Forms

• darcies
  plural

Etymology

Origin of darcy

After Henri-Philibert-Gaspard Darcy (1803–58), French engineer

Example Sentences

See Examples For:

darcy Darcy Darcy,

Olly: are you kidding? even my sister loves darcy and she doesn't love anybody.

From "Everything, Everything" by Nicola Yoon

Olly: jesus. is there a girl on this planet who doesn't love mr. darcy Madeline: All girls love Mr. Darcy?

From "Everything, Everything" by Nicola Yoon

The distinctive jazz vocalist teams with the Metropole Orkest and arranger Darcy James Argue on an album of expressively rendered ballads.

From The Wall Street Journal ● Jul. 13, 2026

Mr. Darcy would never . . . and that’s the point.

From Salon ● Jun. 25, 2026

Bannon and Darcy described Campbell's comments to the Belfast Telegraph as incredulous.

From BBC ● May 7, 2026

The backdrop overall, BellRing CEO Darcy Davenport said during the company’s earnings call, “reflects an increasingly value-focused consumer with greater reliance on promotions, low-price brands and value-priced pack sizes.”

From MarketWatch ● May 5, 2026

“Mr. Darcy is all politeness,” said Elizabeth, smiling.

From "Pride and Prejudice" by Jane Austen

Eve Smith, 21, Darcy Ross, 21, and Rafel Jeanne, 24, died when the car given the false MOT crashed into woodland in St Mellons in March 2023.

From BBC ● Jul. 21, 2026

The distinctive jazz vocalist teams with the Metropole Orkest and arranger Darcy James Argue on an album of expressively rendered ballads.

From The Wall Street Journal ● Jul. 13, 2026

Mr. Darcy would never . . . and that’s the point.

From Salon ● Jun. 25, 2026

BellRing CEO Darcy Horn Davenport said in May that the company had raised prices a few times.

From MarketWatch ● Jun. 11, 2026

“I never thought Mr. Darcy so deficient in the appearance of it as you used to do.”

From "Pride and Prejudice" by Jane Austen