(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.

(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.

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

plural of glare filter

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

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

plural of filter funnel