1

filter

noun fil·ter \ ˈfil-tər \
Updated on: 12 Nov 2017

Definition of filter

1 a : a porous article or mass (as of paper or sand) through which a gas or liquid is passed to separate out matter in suspension
b : an apparatus containing a filter medium
2 a : a device or material for suppressing or minimizing waves or oscillations of certain frequencies (as of electricity, light, or sound)
b : a transparent material (such as colored glass) that absorbs light of certain wavelengths or colors selectively and is used for modifying light that reaches a sensitized photographic material called also color filter
3 : something that has the effect of a filter (as by holding back elements or modifying the appearance of something)
  • his work is too often viewed through the filter of race
  • —Brent Staples
4 : software for sorting or blocking access to certain online material

Examples of filter in a Sentence

  1. She smokes cigarettes with filters.

  2. He placed a red filter on the camera lens.

  3. digital filters that stop high-frequency sounds

Recent Examples of filter from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'filter.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of filter

Middle English filtre, from Medieval Latin filtrum piece of felt used as a filter, of Germanic origin; akin to Old High German filz felt — more at felt

Other Chemical Engineering Terms


2

filter

verb

Definition of filter

filtered; filtering play \ˈfil-t(ə-)riŋ\
transitive verb
1 : to subject to the action of a filter
2 : to remove by means of a filter
intransitive verb
1 : to pass or move through or as if through a filter
2 : to come or go in small units over a period of time
  • people began filtering in

Examples of filter in a Sentence

  1. They've begun filtering their water to remove impurities.

  2. a device that filters impurities from water

  3. sunglasses that filter ultraviolet light

  4. Sunlight filtered through the leaves.

  5. His ideas have filtered down to his children.

  6. The crowd filtered into the arena.

  7. Early election returns have begun to filter in.

Recent Examples of filter from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'filter.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of filter

1576

filter Synonyms

Synonyms
strain, screen
Related Words
leach, percolate
Near Antonyms
cloud, dull, muddy; contaminate, dirty, soil; defile, pollute, taint; begrime, besmirch, foul, sully


FILTER Defined for English Language Learners

filter

noun

Definition of filter for English Language Learners

  • : a device that is used to remove something unwanted from a liquid or gas that passes through it

  • : a device that prevents some kinds of light, sound, electronic noises, etc., from passing through

  • computers : software that prevents someone from looking at or receiving particular kinds of material through the Internet


filter

verb

Definition of filter for English Language Learners

  • : to pass (something, such as a gas or liquid) through a filter to remove something unwanted

  • : to remove (something unwanted) by using a filter

  • : to move through or into something in small amounts or in a gradual way


FILTER Defined for Kids

1

filter

noun fil·ter \ ˈfil-tər \

Definition of filter for Students

1 : a device or a mass of material (as sand or paper) with tiny openings through which a gas or liquid is passed to remove something
  • The filter removes dust from the air.
2 : a transparent material that absorbs light of some colors and is used for changing light (as in photography)

2

filter

verb

Definition of filter for Students

filtered; filtering
1 : to pass through a filter
  • filter water
2 : to remove by means of a filter
  • Sand helps filter impurities from water.

Medical Dictionary

1

filter

noun fil·ter \ ˈfil-tər \

medical Definition of filter

1 : a porous article or mass (as of paper or sand) through which a gas or liquid is passed to separate out matter in suspension
2 : an apparatus containing a filter medium
3 a : a device or material for suppressing or minimizing waves or oscillations of certain frequencies (as of electricity, light, or sound)
b : a transparent material (as colored glass) that absorbs light of certain wavelengths or colors selectively and is used for modifying light that reaches a sensitized photographic material called also color filter

2

filter

verb

medical Definition of filter

filtered; filtering play \-t(ə-)riŋ\
transitive verb
1 : to subject to the action of a filter
2 : to remove by means of a filter
intransitive verb
: to pass or move through or as if through a filter


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