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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.


 - vb. 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.


 - vb. To pass through a filter; to percolate.


 - n. Same as Philter.

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