| filter | | |
| n. (artifact) | 1. filter | device that removes something from whatever passes through it. |
| ~ air cleaner, air filter | a filter that removes dust from the air that passes through it. |
| ~ bacteria bed | layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms. |
| ~ coffee filter | filter (usually of paper) that passes the coffee and retains the coffee grounds. |
| ~ device | an instrumentality invented for a particular purpose.; "the device is small enough to wear on your wrist"; "a device intended to conserve water" |
| ~ drain basket | a filter in a sink drain; traps debris but passes water. |
| ~ filter bed | filter consisting of a layer of sand or gravel for filtering water. |
| ~ fuel filter | a filter in the fuel line that screens out dirt and rust particles from the fuel. |
| ~ diffusing screen, light filter | a transparent filter that reduces the light (or some wavelengths of the light) passing through it. |
| ~ oil filter | a filter that removes impurities from the oil used to lubricate an internal-combustion engine. |
| ~ strainer | a filter to retain larger pieces while smaller pieces and liquids pass through. |
| ~ water filter | a filter to remove impurities from the water supply. |
| ~ glass wool | glass fibers spun and massed into bundles resembling wool. |
| ~ diatomaceous earth, diatomite, kieselguhr | a light soil consisting of siliceous diatom remains and often used as a filtering material. |
| n. (artifact) | 2. filter | an electrical device that alters the frequency spectrum of signals passing through it. |
| ~ electrical device | a device that produces or is powered by electricity. |
| ~ high-pass filter | a filter that passes frequencies above a certain value and attenuates frequencies below that value. |
| ~ low-pass filter | a filter that passes frequencies below a certain value and attenuates frequencies above that value. |
| v. (contact) | 3. filter, filter out, filtrate, separate out, strain | remove by passing through a filter.; "filter out the impurities" |
| ~ separate | divide into components or constituents.; "Separate the wheat from the chaff" |
| v. (contact) | 4. filter, percolate, permeate, sink in | pass through.; "Water permeates sand easily" |
| ~ penetrate, perforate | pass into or through, often by overcoming resistance.; "The bullet penetrated her chest" |
| ~ infiltrate | pass into or through by filtering or permeating.; "the substance infiltrated the material" |
| ~ infiltrate | cause (a liquid) to enter by penetrating the interstices. |
| v. (motion) | 5. dribble, filter, trickle | 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" |
| ~ course, flow, run, feed | move along, of liquids.; "Water flowed into the cave"; "the Missouri feeds into the Mississippi" |
| ~ percolate, leach | permeate or penetrate gradually.; "the fertilizer leached into the ground" |
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