Filter
['fɪltə] or ['fɪltɚ]
Definition
(noun.) device that removes something from whatever passes through it.
(noun.) an electrical device that alters the frequency spectrum of signals passing through it.
(verb.) remove by passing through a filter; 'filter out the impurities'.
Typist: Silvia--From WordNet
Definition
(n.) 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.) To purify or defecate, as water or other liquid, by causing it to pass through a filter.
(v. i.) To pass through a filter; to percolate.
(n.) Same as Philter.
Editor: Nancy
Synonyms and Synonymous
v. a. Strain, pass through a strainer.
v. n. Percolate, transude, exude, strain, ooze.
n. Strainer.
Checked by Jocelyn
Synonyms and Antonyms
SYN:Strain, percolate, refine, distil, ooze, exude, leak, depurate, defecate,clarify
ANT:Befoul, muddle, disturb, thicken
Typist: Sadie
Definition
n. 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. to purify liquor by a filter.—v.i. to pass through a filter: to percolate.—ns. Fil′ter-pā′per porous paper for use in filtering; Fil′ter-pump a contrivance devised by the chemist Bunsen for accelerating the filtering process.
Checker: Quincy
Examples
- To every gallon of juice to be filtered there is placed in the filter 2 ounces of charcoal, 2 scruples of crushed mustard seed, and 6 drachms of ground sassafras root. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- Cut the camomile in pieces and rub fine with the sal-ammoniac; add the lavender water and vinegar by placing all in a glass flask and let it digest for twelve hours and filter. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- The reason why those little preliminary explosions took place was that a little had spattered out on the edge of the filter paper, and had dried first and exploded. Frank Lewis Dyer. Edison, His Life and Inventions.
- Let stand for a few days and filter through a felt bag or filtering paper. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- The same form of tube answers equally well for keeping a constant level in a filter or drying chamber. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- After concentration the crystallized sugar is separated from the syrup by a centrifugal filter, in which the liquid is thrown from the crystallized sugar by centrifugal action. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- Then add the mercurial solution, filter, and make up the whole to the measure of one imperial pint (20 ounces) with more orange-flower water. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- Practically all household filters of drinking water are made of charcoal. Bertha M. Clark. General Science.
- Pure siliceous sands are very valuable for the manufacture of glass, for making mortar, filters, ameliorating dense clay soils, for making molds in founding and for many other purposes. Various. The Wonder Book of Knowledge.
- The foul, bad-smelling gases which arise from sewers can be prevented from escaping and passing to streets and buildings by placing charcoal filters at the sewer exits. Bertha M. Clark. General Science.
- In like manner the yellow and blue plates are made by the use of appropriate color filters, each of which acts for its required color as that used for the red. Various. The Wonder Book of Knowledge.
- The Alberger system of salt manufacture is a mechanical process which subjects the salt brine to a much higher temperature and removes the impurities by means of mechanical filters. Various. The Wonder Book of Knowledge.
- The nose is provided with small hairs and a moist inner membrane which serve as filters in removing solid particles from the air, and in thus purifying it before its entrance into the lungs. Bertha M. Clark. General Science.
- The filtration plants owned and operated by large cities are usually safe; there is careful supervision of the filters, and frequent and effective cleanings are made. Bertha M. Clark. General Science.
- To every gallon of juice to be filtered there is placed in the filter 2 ounces of charcoal, 2 scruples of crushed mustard seed, and 6 drachms of ground sassafras root. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- In some cities where the water is very hard, as in Columbus, Ohio, it is softened and filtered at public expense, before it leaves the reservoirs. Bertha M. Clark. General Science.
- But is has filtered through into elementary education and largely controls its processes and aims. John Dewey. Democracy and Education.
- This was left on the meat for eighteen hours, and then filtered off through muslin. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- The latter is then filtered through bone black until it is colorless and is then evaporated in the vacuum pan, which is the important invention of the century in sugar making. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- The lines _b_ show the relative number of people who died of typhoid fever before the water was filtered; the lines _a_ show the numbers who died after the water was filtered. Bertha M. Clark. General Science.
- All the water which reaches the well pipes will have filtered through the soil bed and therefore will probably be safe. Bertha M. Clark. General Science.
- This is done by attaching to the service pipe tanks filled with filtering material, through which the water flows before reaching the boiler. William Henry Doolittle. Inventions in the Century.
- After filtering it is again boiled, and if any scum or impurities appear on the surface they are removed, when the juice is to be bottled, corked tightly, and should be left for one year. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- Let stand for a few days and filter through a felt bag or filtering paper. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- Laboratory processes like distilling, filtering, crystallization, sublimation, became known to the Europeans through them. Walter Libby. An Introduction to the History of Science.
- This is accomplished by a central pumping and filtering plant and the return of the oil from all parts of the works by gravity. Frank Lewis Dyer. Edison, His Life and Inventions.
Checked by Elton