(1):
(v. i.) To pass through a filter; to percolate.
(2):
(n.) Any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may passed to cleanse it from the solid or impure matter held in suspension; a chamber or device containing such substance; a strainer; also, a similar device for purifying air.
(3):
(n.) To purify or defecate, as water or other liquid, by causing it to pass through a filter.
(4):
(n.) Same as Philter.