a number indicating the increased exposure that a particular film should receive when a photograph is taken using a particular filter.
noun 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. filter feeder An aquatic animal, such as a clam or sponge, that feeds by filtering tiny organisms or […]
- Filter feeding
noun 1. (zoology) a method of feeding occurring in some aquatic animals, such as planktonic invertebrates and whalebone whales, in which minute food particles are filtered from the surrounding water
- Filtering operation
filtering operation n. The surgical creation of a fistula between the anterior chamber of the eye and the subconjunctival space, as for glaucoma.
- Filter out
verb 1. (intransitive, adverb) to become known gradually; leak: rumours filtered out about the divorce