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noun, plural dar·cies.
  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.

Origin of darcy

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


  1. a male given name.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for darcy


  1. geology a unit expressing the permeability coefficient of rockSymbol: D

Word Origin

named after Henri-Philibert-Gaspard Darcy (1803–58), French hydraulic engineer


  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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

darcy in Science


  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.


  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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.