filtration (n.)
- clarification
- distillation
- effusion
- elution
- excretion
- extraction
- extravasation
- exudation
- leaching
- ooze
- oozing
- percolation
- purification
- refinement
- screening
- seepage
- separation
- sifting
- spiritualization
- straining
- sublimation
- transudation
- weep
- weeping
- winnowing
