Filtered definitions and example sentences on Wordnik

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American Heritage Dictionary (10)

noun A porous material through which a liquid or gas is passed in order to separate the fluid from suspended particulate matter.
noun A device containing such a material, especially one used to extract impurities from air or water.
noun Any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiations of certain frequencies while allowing others to pass.

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Century Dictionary (23)

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. Having for trial-sake filtered it through cap-paper, there remained in the filtre a powder of a very deep and lovely colour. Boyle, Works, I. 365.
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.
Aërating filter. See aerate.

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After the salt re-crystallizes, it is dried, filtered, and air-cooled. — Citizendium, the Citizens' Compendium - Recent changes [en]
Invalid URLs are more reliably filtered, the compatibility to third-party hacks and extensions has been improved, and databases load slightly faster. — MacMegasite
Since I don't know Arabic, my information about the Arab world comes to me already filtered, which is a reason for concern, of course -- am I being misled, misinformed, misdirected, mystificated? — Gypsy Scholar
Any attempt to connect to these ports via telnet will also be filtered, and thus, most likely, fail. — SecurityFocus News
Research is filtered, and in China it is sometimes skewed because analysts and research organizations that operate in China have hidden stakes in certain businesses - trust us on that. — ChinaTechNews.com

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