n. [ F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See Feuter. ] 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. [ 1913 Webster ]
Filter bed,
Filter gallery,
v. t.
Filtering paper,
Filter paper
v. i. To pass through a filter; to percolate. [ 1913 Webster ]
n. Same as Philter. [ 1913 Webster ]
adj. having a tip designed to filter the smoke; -- of a cigarette or cigar;