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filter
1: a porous article or mass (as of paper or sand) through which a gas or liquid is passed to separate out matter in suspension2: an apparatus containing a filter medium3 a: a device or material for suppressing or minimizing waves or oscillations of certain frequencies (as of electricity, light, or sound) b: a transparent material (as colored glass) that absorbs light of certain wavelengths or colors selectively and is used for modifying light that reaches a sensitized photographic material—called also color filter
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