Category:Filter

Fil"ter, n. Etym: [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See Feuter.]

Defn: 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. Filter bed, a pond, the bottom of which is a filter composed of sand gravel. -- Filter gallery, an underground gallery or tunnel, alongside of a stream, to collect the water that filters through the intervening sand and gravel; -- called also infiltration gallery.

filter Fil"ter, v. t. [imp. & p. p. Filtered; p. pr. & vb. n. Filtering] Etym: [Cf. F. filter. See Filter, n., and cf. Filtrate.]

Defn: To purify or defecate, as water or other liquid, by causing it to pass through a filter. Filtering paper, or Filter paper, a porous unsized paper, for filtering.

filter Fil"ter, v. i.

Defn: To pass through a filter; to percolate.

filter Fil"ter, n.

Defn: Same as Philter.