Meaning

noun device that removes something from whatever passes through it

noun an electrical device that alters the frequency spectrum of signals passing through it

verb remove by passing through a filter

originFrom 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.

Etymology from Wiktionary, CC BY-SA 3.0