Definitions for: Filter


[n] device that removes something from whatever passes through it
[n] an electrical device that alters the frequency spectrum of signals passing through it
[v] pass through; "Water permeates sand easily"
[v] remove by passing through a filter; "filter out the impurities"
[v] run or flow slowly, or in an unsteady stream; "reports began to dribble in."



Webster (1913) Definition: 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}.


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.


Fil"ter, v. i.
To pass through a filter; to percolate.


Fil"ter, n.
Same as Philter.


filter p [] = []
filter p (x:xs) = if p x then x : rest else rest
where
rest = filter p xs

Synonyms: dribble, filter out, filtrate, percolate, permeate, separate out, sink in, strain, trickle

See Also: air cleaner, air filter, bacteria bed, coffee filter, course, device, diatomaceous earth, diatomite, diffusing screen, drain basket, electrical device, filter bed, flow, fuel filter, glass wool, infiltrate, kieselguhr, leach, light filter, oil filter, penetrate, percolate, perforate, run, separate, strainer, water filter

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