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a. A porous material through which a liquid or gas is passed in order to separate the fluid from suspended particulate matter.
b. A device containing such a material, especially one used to extract impurities from air or water.
a. Any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiations of certain frequencies while allowing others to pass.
b. A colored glass or other transparent material used to select the wavelengths of light allowed to reach a photosensitive material.
3. Computers A program or device that blocks email or restricts website access when specific criteria are met.
4. Informal The ability or tendency to censor oneself, as to avoid causing embarrassment or offense: My roommate has no filter and says whatever he's thinking at the moment.
v. fil·tered, fil·ter·ing, fil·ters
1. To pass (a liquid or gas) through a filter.
2. To remove by passing through a filter: filter out impurities.
3. Computers To use a filter to block or restrict access to: a program that filters spam.
4. Informal To censor (oneself), as to avoid causing embarrassment or offense.
1. To pass through or as if through a filter: Light filtered through the blinds.
2. To come or go gradually and in small groups: The audience filtered back into the hall.

[Middle English filtre, from Old French, from Medieval Latin filtrum, of Germanic origin; see pel- in Indo-European roots.]

fil′ter·er n.
fil′ter·less adj.


a thing which filters or acts as a filter
References in periodicals archive ?
Thus, in Brave Orchid's warning, "[y]ou must not tell" (Woman 3), there is a stark emphasis on herself as the filterer and executioner of the patriarchal order.
In extracts from his forthcoming book The New Digital Age, the executive chairman of the search engine giant claims China is: "the world's most active and enthusiastic filterer of information", according to a report in the Wall Street Journal.
The authors reportedly brand China "the world's most active and enthusiastic filterer of information" and "the most sophisticated and prolific" hacker of foreign companies.
The giant barnacle, on the other hand, is a sessile, omnivorous filterer in its adult phase, experiencing rapid growth (Lopez et al.
At the very least, this article should apprise the reader of how the media influences the way we think about myopia, and help the reader become a more critical filterer of data and opinions about disease in general.
Anderson Power Products[R] (APP) and Schaffner EMC have partnered to produce the patents pending ACARA filterer electrical power connectors.
And, "filmmaker Roberto Rossellini's orientation to reality is like that of Matisse or Hemingway, Faulkner, and Dos Passos: as a filterer of facts.
The filterer comes to your home or office and hooks a portable filter up to a water line.