0 any of several types of equipment or devices for removing solids from liquids or gases, or for removing particular types of light:
a water filter
a dust filter
Ozone is the earth's primary filter for ultraviolet radiation.
I like to experiment with different light filters on my camera.
A filter on the company computer network is designed to block obscene material.
There's a filter that makes all your pictures look like old sepia photographs.
Instagram/Snapchat filters
1 a green, arrow-shaped light that is part of a set of traffic lights and tells drivers when they can turn left or right:
3 to remove solids from liquids or gases, or to remove particular types of light, using special equipment:
The water is filtered to remove any impurities.
Devices in the two chimneys would filter (out) (= remove) radioactive dust.
The software is well suited to small mobile phone screens because it filters out unnecessary information.
4 a piece of equipment or a device for removing solids from liquids or gases, or for limiting the particular type of light, sound, or electricity going through it:
5 If something filters down, in, out, or through, it appears or happens gradually or to a limited degree:
[ I always + adv/prep ] Reports of the accident began to filter in.
[ I always + adv/prep ] Sunlight filtered through the branches.
6 a computer program that receives and processes information before displaying it or preventing it from being seen:
7 to use a computer program to process information before displaying it or preventing it from being seen:
Hence, if one is attempting to extract the correlated signal, then, with increasing noise, the filters must restrict their filtering to lower and lower frequencies.
The resulting code of the first stage is filtered to reduce the quantal noise.
Luminance levels were controlled by placing neutral density filters directly in front of the cat's eyes.
Other responses characteristics (such as filters or nonlinearities) may also influence the phase data.
Test luminances were reduced by attenuating the light source with neutral density filters.
The intensity and spectral content of each beam was independently controlled by sets of neutral density and narrowband interference filters.
The intensity of the light was adjusted using an array of neutral density filters mounted below the shutter.
The radiance of each beam could be varied by the insertion of fixed or variable neutral density filters.
中文繁体
除去物件的裝置, 濾器, 過濾器…
More中文简体
除去物件的设置, 滤器, 过滤器…
MoreEspañol
filtro, filtrar, penetrar…
MorePortuguês
filtro, filtrar…
More日本語
フィルター, (液体、ガス)をろ過する…
MoreTürk dili
süzmek, süzgeçten geçirmek, elemek…
MoreFrançais
filtrer, filtre [masculine], filtre…
MoreCatalan
filtre, filtrar…
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