• WordNet 3.6
    • v filter pass through "Water permeates sand easily"
    • v filter remove by passing through a filter "filter out the impurities"
    • v filter 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"
    • n filter device that removes something from whatever passes through it
    • n filter an electrical device that alters the frequency spectrum of signals passing through it
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: A seagull can drink salt water because it has special glands that filter out the salt
    • n Filter 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.
    • n Filter Same as Philter.
    • v. i Filter To pass through a filter; to percolate.
    • v. t Filter To purify or defecate, as water or other liquid, by causing it to pass through a filter.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: The kidneys filter over 400 gallons of blood each day
    • n filter A device for arresting and separating any matter mechanically suspended in a liquid. Filters used in the processes of analytical chemistry are made of paper or asbestos. The filter-paper is bibulous, consisting of nearly pure cellulose, with only bare traces of mineral matter. Many precipitates are more conveniently separated by an asbestos filter, the most common form consisting of an ordinary platinum crucible having the bottom perforated with fine holes which are covered with a thin asbestos felt. In the arts filters are used to purify water, syrups, vinegar, the juices of cane and fruits, oils, liquors, sewage, liquid by-products, and molten metals. The materials used in filtration are gravel, sand, charcoal, bone-black, sponge, fabrics, woven wire netting, asbestos, porous brick and stone, mineral wool, rope, paper, and powdered glass. The devices used to hold the straining material are in a great variety of forms, from a simple wick or loose cloth hung over the edge of a bowl of water and acting as a capillary strainer, to a settling-pond filtering 400,000 gallons of water in a day. The most common filter is a cone of bibulous paper, or a square of cloth sewed together to form a bag (called Hippocrates's sleeve). Filters also consist of porous brick or stone partitions, as in a cistern, or vessels partly filled with sand and gravel, or tubes filled with sponge, charcoal, or sand, etc. Domestic filters are used in connection with pumps and water-faucets. To cause the liquid to pass through a filter, the weight of a column of water, the pressure of the atmosphere, mechanical force from a screw or from steam-pressure, and centrifugal force are employed, as in the centrifugal filter, oil-filter, vacuum-filter, and many forms of pressure-filters. Filters are also made reversible and intermittent, so that the filtering material may be freed from the collected sediment. In some pressure-filters the liquid or syrup is within a cylinder, and is forced outward through rings of fabric under steam-pressure; in others it is forced through a series of strainers piled one above another. Where bone-black and charcoal are used, there is also a filtering or straining of a certain amount of gas and organic material that would pass through any other filter without detention. Filters are also used to remove dust and floating matter from air, but such devices are more properly termed air-strainers.
    • n filter Specifically In fish-culture, a long box in which screens, usually of flannel, are placed, through which the water is filtered before it passes into the hatching-troughs. Also called filtering-box, filtering-tank.
    • filter To purify or defecate, as water or other liquid, by passing it through a filter or any cleansing medium; strain.
    • filter Specifically In analytic chemistry, to separate (a solution) from the solid matter contained in it, either for the purpose of collecting and saving the solid matter, usually a precipitate, or of preparing the solution for further operations.
    • filter To percolate; pass through or as through a filter.
    • filter Same as felter.
    • n filter See philter.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: One tree can filter up to sixty pounds of pollutants from the air each year.
    • n Filter fil′ter a contrivance arranged for purifying a liquid of solid insoluble matter by passing it through some porous substance which does not allow the solid particles to pass through
    • v.t Filter to purify liquor by a filter
    • v.i Filter to pass through a filter: to percolate
    • ***


Webster's Revised Unabridged Dictionary
F. filtre, the same word as feutre, felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See Feuter


In literature:

Stir well together, allow all sediment to settle, or better, filter-press the mass.
"The Dyeing of Woollen Fabrics" by Franklin Beech
A ship equipped with filters is no better off when attacked than one without.
"Invaders from the Infinite" by John Wood Campbell
Mix and let it stand forty-eight hours, with occasional shaking, and then filter.
"The Handy Cyclopedia of Things Worth Knowing" by Joseph Triemens
The gray beams of early dawn, filtering through a now taller vault of forest, found him far up the slope and mounting still steeper grades.
"Terry" by Charles Goff Thomson
When you wish to filter by ascent, you introduce the liquor to be filtered between the two bottoms.
"The American Practical Brewer and Tanner" by Joseph Coppinger
The dull light of the Venerian day was filtering in through the windows the next morning when the Terrestrians awoke.
"The Black Star Passes" by John W Campbell
Other bands, looking like legitimate prospecting parties, began to filter into the Badlands.
"The Cosmic Computer" by Henry Beam Piper
The telescopic screen went off, and the unmagnified screen darkened as the filters went on.
"Space Viking" by Henry Beam Piper
A more effective type of filter is the Chamberlain-Pasteur filter.
"An Elementary Study of Chemistry" by William McPherson
The flow from the Berkefeld filter is more rapid than from the Pasteur.
"Human Foods and Their Nutritive Value" by Harry Snyder

In poetry:

The desert is magical shadow of dusk
Filtering over red sands
And all is as still as a drifted pueblo
Raised through the toil of dead hands.
"Hopi-Land" by Norman MacLeod
Heap not the heavy marble o'er my head
To shut away the sunshine and the dew;
Let small blooms grow there, and let grasses wave,
And raindrops filter through.
"Until Death" by Elizabeth Akers Allen
Hey the green ribbon! we kneeled beside it,
We parted the grasses dewy and sheen;
Drop over drop there filtered and slided
A tiny bright beck that trickled between.
"Divided" by Jean Ingelow
Here the sunshine, filtering down,
Through leaves of emerald, dun and brown,
Is green instead of golden
And the hum and roar of the distant town
In an endless hush is holden.
"In the Country" by Kate Seymour Maclean
I know there is plenty of folks would explain
Why such water had ort to be filtered or strained.
Sech people as that never suffered from thirst,
Or they’d think of it later and drink it down first.
"Drinkin' Water" by Bruce Kiskaddon
Perhaps ‘t is folly, but still I feel
My heart-strings quiver, my senses reel,
Thinking how like a fast stream we range
Nearer and nearer to yon dread change,
When soul and spirit filter away,
And leave nothing better than senseless clay.
"Thoughts On Death (From The Swedish Of C. Lohman)" by George Borrow

In news:

You'll get filtered water instantly at the flip of a switch, so you won't have to refill a small pitcher multiple times a day.
Novel planar microstrip lines can be used to assemble bandpass filters with wideband response at C-band frequencies, achieving coupling through the use of open-ended stubs.
The obese corpse reportedly led to overheating in the crematorium 's filter system, triggering the blaze.
Crux Successfully Completes Funding for Advanced Filter for PE Prevention.
Curtiss will drop his filter-refined sway alongside Miami's Danny Daze and San Francisco's own Rich Korach on Friday, July 6, at Public Works 10 pm, $10-$12.
Reduces clogging up of vacuum filters, and helps maintain suction efficiency.
An artist's rendering of CFBDSIR2149, as viewed through an infrared filter.
Although some water filters can disinfect water, according to CDC, "most of the portable filters on the market do not effectively remove viruses.".
However, the water may still require disinfection to kill remaining pathogens, and it might be possible to use the slow-sand filters in combination with a water- disinfection system like the new solar UV approach.
Dire doings of 'Dragon Tattoo' filtered through American lens.
Appeared in print as "Hydraulic filter cart works double time ".
The Y2K Fluid Power tandem filter cart contains two independent flow paths that remove particles and free water from two different oils.
Quality Filters Inc, in Robertsdale will begin production this summer of air conditioner and furnace filters as part of a four-year agreement with Reckitt Benckiser, parent company of Lysol .
Quality Filters Inc, has set an early August shipping date for 30,000 units of its new air conditioner and furnace filters to national home improvement chain Menards.
0TDC Filter introduces a money-saving, patented retrofit kit for oval-shaped dust collector cartridge filters.

In science:

The interpretation relies on a mapping of internal variables of the generated QBF into concepts of the problem description which is provided by filter.
QUIP - A Tool for Computing Nonmonotonic Reasoning Tasks
Figure 8.1: The Kalman Filtering process. A passing electron causes a strip to fire in each plane (light grey).
A Search for Gamma-Ray Bursts and Pulsars, and the Application of Kalman Filters to Gamma-Ray Reconstruction
Assign it to the track. – Remove all successive hits from the track. – Filter and smooth. – Check free hits again, to see if, in this new configuration, the track would prefer different hits upstream. – If the χ2 if smaller, keep the new tracks.
A Search for Gamma-Ray Bursts and Pulsars, and the Application of Kalman Filters to Gamma-Ray Reconstruction
A Physicist’s Guide to Kalman Filters, World Wide Web, Mar 1998. http: //
A Search for Gamma-Ray Bursts and Pulsars, and the Application of Kalman Filters to Gamma-Ray Reconstruction
Empirical Analysis of Predictive Algorithms for Collaborative Filtering.
A Connection-Centric Survey of Recommender Systems Research