/perr'keuh lay"sheuhn/ , n.
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.
[ 1605-15; percolation- (s. of percolatio ). See PERCOLATE, -ION ]