Meaning of filter feeder

fil'ter feed"er

Pronunciation: [key]
  1. an aquatic animal that feeds on particles or small organisms strained out of water by circulating them through its system: includes most of the stationary feeders, as clams, oysters, barnacles, corals, sea squirts, and sponges.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.