(transitive) To permeate or suffuse something, especially with a liquid or with light.
(transitive) To force a fluid to flow over or through something, especially through an organ of the body.
2001, Alan B. R. Thomson, Gary Wild, Lipid Absorption and the Unstirred layers, Charles M. Mansbach II, Patrick Tso, Arnis Kuksis (editors), Intestinal Lipid Metabolism, Kluwer Academic / Plenum Publishers, page 140,
The change in the ratio of the uptake of xylose and urea could not be explained just by an alteration in UWL resistance or by a change in the laminar flow properties of the perfused fluid.