Pronunciation: (pûr"ku-lā'shun), [key]
1. the act or state of percolating or of being percolated.
2. Pharm.the extraction of the soluble principles of a crude drug by the passage of a suitable liquid through it.
3. Geol.the slow movement of water through the pores in soil or permeable rock.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.