/dahr"see/ , n. , pl. 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 ]