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filter

noun [C] (EQUIPMENT)
 
 
/ˈfɪl.tər/ US  /-t̬ɚ/

Definition

C2 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 I like to experiment with different light filters on my camera. Ozone is the Earth's primary filter for ultraviolet radiation.Straining and filtering devices
(Definition of filter noun (EQUIPMENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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