A transparent sheet (usually of glass or plastic) placed over a monitor to reduce glare.

An optical filter in which the wavelengths that are not transmitted are removed by interference rather than by absorption or scattering.

A lane of traffic reserved for those making a specific turn at the next junction

(transitive) To selectively remove part of something. / (intransitive) To come out gradually (e.g. news).

Alternative spelling of filter feeder

(chemistry) A glass funnel, into which is placed filter paper or other material, through which a liquid / solid mixture is poured in order to separate them.

Porous paper used for filtration, typically in a filter funnel.

A filter of trapezoidal shape specified by four corner frequencies, f1 through f4. The filter rejects below f1 and above f4, is linear from f1 to f2 and from f3 to f4, and is flat from f2 to f3.

A layer of gravel, sand, or other material through which liquid is passed in order to remove impurities; also, a pond or tank containing such a layer.

(signal processing) A bandstop filter with a narrow stopband.