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filter

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filter


  7  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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}. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Filter  \Fil"ter\,  v.  i. 
  To  pass  through  a  filter;  to  percolate. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Filter  \Fil"ter\,  n. 
  Same  as  {Philter}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  filter 
  n  1:  removes  something  from  whatever  passes  through  it 
  2:  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  permeated  sand  easily"  [syn:  {percolate}, 
  {sink  in},  {permeate}] 
  3:  run  or  flow  slowly,  or  in  an  unsteady  stream:  "reports  began 
  to  dribble  in."  [syn:  {trickle},  {dribble}] 
 
  From  Jargon  File  (4.2.3,  23  NOV  2000)  [jargon]: 
 
  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}. 
 
 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  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}] 
 
 




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