fil·ter /ˈfɪltɚ/ 名詞
Fil·ter 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.
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.
Fil·ter, v. t. [imp. & p. p. Filtered p. pr. & vb. n. Filtering] 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.
Fil·ter, v. i. To pass through a filter; to percolate.
Fil·ter, n. Same as Philter.
n 1: device that removes something from whatever passes through
2: an electrical device that alters the frequency spectrum of
signals passing through it
v 1: remove by passing through a filter; "filter out the
impurities" [syn: filtrate, strain, separate out,
2: pass through; "Water permeates sand easily" [syn: percolate,
sink in, permeate]
3: run or flow slowly, as in drops or in an unsteady stream;
"water trickled onto the lawn from the broken hose";
"reports began to dribble in" [syn: trickle, dribble]