- a device containing paper, sand, chemicals, etc. that a liquid or gas is passed through in order to remove any materials that are not wanted
- an air/oil filter
- a coffee/water filter
- filter paper for the coffee machine
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- a device that allows only particular types of light or sound to pass through it
- The camera has an anti-glare filter.
- (computing) a program that processes information to leave out the types that are not wanted, or that stops particular types of electronic information, email, etc. from being sent to a computer
- When you do a search, there are filters for size and brand.
- Spam filters block out almost all threats.
- (computing) a tool on digital cameras, photo apps, etc. that allows you to change the appearance of an image
- The software allows you to apply filters, remove blemishes and add text to your images.
- (British English) a light on a set of traffic lights showing that traffic can turn left (or right) while traffic that wants to go straight ahead or turn right (or left) must wait
- a filter lane
Word Originlate 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 felt.
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filter