Filter \Fil"ter\, v. t. [imp. & p. p. Filtered; p. pr. & vb.
n. Filtering] [Cf. F. filter. See Filter, n., and cf.
Filtrate.]
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.
Source: Webster's Revised Unabridged Dictionary (1913)
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Filter \Fil"ter\, 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.
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.
Source: Webster's Revised Unabridged Dictionary (1913)
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