WordWeb Online

1. Device that removes something from whatever passes through it
    
2. An electrical device that alters the frequency spectrum of signals passing through it
    
3. [Brit] A traffic light used to allow some of the traffic to turn off while the rest remains stopped

1. Remove by passing through a filter
   "filter out the impurities";
   - filtrate, strain, separate out, filter out
    
2. Pass through
   "Water filters sand easily";
   - percolate, sink in, permeate
    
3. Run or flow slowly, as in drops or in an unsteady stream
   "water filtered onto the lawn from the broken hose";
   - trickle, dribble

Sounds like: fillip, Philter, philtre, phi

Derived forms: filtered, filtering, filters

Type of: course, device, electrical device, feed, flow, penetrate, perforate, run, separate

Encyclopedia: Filter, map, reduce