(biology) Any aquatic animal that obtains nourishment by filtering particles of food from the water in which it lives.

(Internet) Web filtering, content-control software or spam-blocking solutions.

plural of air filter

A filter for removing dust and other particles from a stream of air, typically used in the air intake of an internal combustion engine, the output of an air compressor, the supply duct of a forced-air furnace, etc.

plural of glare filter

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