## Meanings
1. A device that removes unwanted things from a liquid, gas, or other substance passing through it.
2. To pass something through a device to remove unwanted parts.
3. A digital effect that changes the look of a photo or video.
4. To sort or select items so only the ones you want remain.

## Examples
- The water filter removes dirt and makes the water safe to drink.
- This machine filters out the impurities from the oil.
- She added a bright filter to her holiday photo.
- You can filter the search results by price.

## Antonyms
- ideal

## Derived Forms
- biofilter
- bitfilter
- chemofilter
- clear-filter
- defilter
- diafilter
- electrofilter
- filter-feeder
- filterability
- filterable
- filterer
- filtergram

## Related Forms
- filtrate
- filtration
- filtride

## Roots and Affixes
- Root: *pel- (beat)
- Root: filtre
- Root: filtrum
- Root: *filtir
- Root: *felt

## Etymology
From Middle English filtre, from Medieval Latin filtrum (compare also Old French feutre (“felt; filter”)), from Frankish *filtir, from Proto-West Germanic *felt. See felt. Doublet of phin.

## AI Etymology
Filter comes from Middle English filtre, from Medieval Latin filtrum (compare also Old French feutre (“felt; filter”)), from Frankish *filtir, from Proto-West Germanic *felt. See felt. Doublet of phin. In current use, the main senses are “A device that removes unwanted things from a liquid, gas, or other substance passing through it” and “To pass something through a device to remove unwanted parts”.

## Topics
- Technology & Computing
- Materials & Substances

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