permeate

Short definition from Wiktionary

Verb

1. 1
   To pass through the pores or interstices of; to penetrate and pass through without causing rupture or displacement; applied especially to fluids which pass through substances of loose texture
2. 2
   To enter and spread through; to pervade.

Noun

1. 1
   A watery by-product of milk production.
2. 2
   Liquid that has passed through a filtration system.