[1] : The Collaborative International Dictionary of English v.0.48

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.
   1913 webster

   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.
      1913 webster
see also:
feuter filter bed filter gallery infiltration gallery 

[2] : The Collaborative International Dictionary of English v.0.48

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.
   1913 webster

   filtering paper, or filter paper, a porous unsized paper,
      for filtering.
      1913 webster
see also:
filtered filtering filter filtrate filtering paper filter paper 

[3] : The Collaborative International Dictionary of English v.0.48

filter \fil"ter\, v. i.
   to pass through a filter; to percolate.
   1913 webster

[4] : The Collaborative International Dictionary of English v.0.48

filter \fil"ter\, n.
   same as philter.
   1913 webster
see also:
philter 

[5] : WordNet (r) 2.0

filter
     n 1: device that removes something from whatever passes through
          it
     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,
          filter 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
see also:
filtrate strain separate out filter out percolate sink in 
permeate trickle dribble 

[6] : Moby Thesaurus II by Grady Ward, 1.0

87 moby thesaurus words for "filter":
   bleed, bolt, butterfly, cheesecloth, clarifier, clarify, clean,
   clear, cloth, colander, condense, cradle, cribble, decrassify,
   depurate, diffusing screen, discharge, distill, drain, dribble,
   drip, dripple, drop, edulcorate, effuse, eliminate, elute, emit,
   essentialize, exclude, excrete, exfiltrate, extract, extravasate,
   exudate, exude, filtrate, frosted glass, frosted lens, gauze,
   gelatin filter, give off, ground glass, gurgle, leach, lens hood,
   light filter, lixiviate, lixiviator, membrane, ooze, pass through,
   percolate, percolator, purifier, purify, rectify, reek, refine,
   refiner, refinery, riddle, rocker, run through, screen, seep,
   separate, sieve, sift, sifter, smoked glass, spiritualize, spurtle,
   stained glass, strain, strainer, sublimate, sublime, transude,
   trickle, try, weed out, weep, winnow, winnowing basket,
   winnowing fan, winnowing machine

[7] : Jargon File (4.3.1, 29 Jun 2001)

filter n. very common; orig. unix, now also in ms-dos a
   program that processes an input data stream into an output data stream
   in some well-defined way, and does no i/o to anywhere else except
   possibly on error conditions; one designed to be used as a stage in a
   `pipeline' see plumbing. compare sponge.


see also:
unix ms-dos plumbing sponge 

[8] : The Free On-line Dictionary of Computing (27 SEP 03)

filter
     
        1. originally unix, now also ms-dos a program that
        processes an input data stream into an output data stream in
        some well-defined way, and does no i/o to anywhere else except
        possibly on error conditions; one designed to be used as a
        stage in a pipeline see plumbing.  compare sponge.
     
        2. functional programming a higher-order function which
        takes a predicate and a list and returns those elements of
        the list for which the predicate is true.  in haskell:
     
        	filter p      = 
        	filter p x:xs = if p x then x : rest else rest
        			  where
        			  rest = filter p xs
     
        see also filter promotion.
     
        jargon file
     
     
see also:
unix ms-dos pipeline plumbing sponge functional programming 
higher-order function predicate haskell filter promotion jargon file 

Filter >> F Words
Filter, definition of term: Filter
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Filter Paper >> F Words
Filter Paper, definition of term: Filter Paper
filter+paper_pag1.html

Filter Out >> F Words
Filter Out, definition of term: Filter Out
filter+out_pag1.html

Water Filter >> W Words
Water Filter, definition of term: Water Filter
water+filter_pag1.html

Air Filter >> A Words
Air Filter, definition of term: Air Filter
air+filter_pag1.html