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   filter

   /ˈfɪltə/

   noun

   • 1. a porous device for removing impurities or solid particles from a liquid or gas passed through it: "an oil filter"
   • ▪ a filter tip: "a cheap filter cigarette"
   • ▪ a screen, plate, or layer of a substance which absorbs light or other radiation or selectively absorbs some of its components: "filters can be used in photography to reduce haze"
   • ▪ a device for suppressing electrical or sound waves of frequencies not required.
   • ▪ (in image-editing software) a function used to alter the overall appearance of an image in a specific manner: "many other apps also offer filters for enhancing photos"
   • ▪ a piece of software that processes data before passing it to another application, for example to reformat characters or to remove unwanted types of material.
   • 2. an arrangement whereby vehicles may turn left (or right) while other traffic waiting to go straight ahead or turn right (or left) is stopped by a red light: British "a filter lane"
   • ▪ a traffic light signalling a filter arrangement.

   verb

   • 1. pass (a liquid, gas, light, or sound) through a device to remove unwanted material: "the eye filters out ultraviolet radiation" Similar sievestrainsiftfiltrateriddleclarifypurifyclearcleanmake purerefinetreatprocessdecontaminate
   • ▪ process or assess (items) in order to reject those that are unwanted: "you'll be put through to a secretary whose job it is to filter calls"
   • ▪ process or treat with a filter.
   • 2. move slowly in a specified direction: "the players filtered out on to the pitch" Similar seeppercolateleaktrickleoozedribblebleedflowdrainwellexudeescapeleach
   • ▪ (of light or sound) enter a place slowly or in small quantities: "sunlight filtered in through the thin curtains" Similar seeppercolateleaktrickleoozedribblebleedflowdrainwellexudeescapeleach
   • ▪ (of information) gradually become known: "the news began to filter in from the hospital"
   • ▪ (of traffic) be allowed to pass to the left or right at a junction while traffic going straight ahead is halted. British

   Word Origin late Middle English (denoting a piece of felt): from French filtre, from medieval Latin filtrum ‘felt used as a filter’, of West Germanic origin and related to felt1.

   Scrabble Points: 9

   • F

     4

   • I

     1

   • L

     1

   • T

     1

   • E

     1

   • R

     1

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