Darcy's law

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Dar·cy's law

 (där′sēz′)
n. Geology
A law stating that the rate at which a fluid flows through a permeable medium, such as an aquifer, is directly proportional to the drop in elevation between two places in the medium and inversely proportional to the distance between them.

[After Henry Philibert Gaspard Darcy.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.