noun
plural -ters
[count] 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
verb
-ters; -tered; -tering
[+ obj] to pass (something, such as a gas or liquid) through a filter to remove something unwanted
to remove (something unwanted) by using a filter
always followed by an adverb or preposition [no obj]
to move through or into something in small amounts or in a gradual way
to come or go slowly in small groups or amounts