noun, plural darcies.
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.

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

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a male given name.
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World English Dictionary
darcy (ˈdɑːsɪ)
geology D a unit expressing the permeability coefficient of rock
[named after Henri-Philibert-Gaspard Darcy (1803--58), French hydraulic engineer]

Darcy (ˈdɑːsɪ)
(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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American Heritage
Science Dictionary
darcy   (där'sē')  Pronunciation Key 
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.
Darcy, , Henry Philibert Gaspard 1803-1858.  
British geologist 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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