filter

(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. Synonyms: filtrate, strain, separate out, filter out. Example: "Filter out the impurities."

(verb) pass through. Synonyms: percolate, sink in, permeate. Example: "Water permeates sand easily."

(verb) run or flow slowly, as in drops or in an unsteady stream. Synonyms: trickle, dribble. Examples: "Water trickled onto the lawn from the broken hose." "Reports began to dribble in."