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filterMain Entry: 1fil·ter Pronunciation: \ˈfil-tər\ Function: noun Etymology: 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 Date: 1563 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
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