filter has definitions from the fields of physics,chemistry
[ verb ] (chemistry) remove by passing through a filter


"filter out the impurities"

Used in print

(Booth Hemingway and Stuart H. Brown,...)

Unless you want_to make your wife a pool widow and to spend a great many_of your leisure hours nursing your pool 's pristine purity , its care and feeding - from pH content to filtering and vacuuming - is best left to a weekly or bi-monthly professional service .

Once on the water , these little visitors seldom leave , and this adds to your filtering and vacuuming problems as_well as providing a slapping good time for all those present .

[ noun ] device that removes something from whatever passes through it

Used in print

(A. N. Nagaraj and L. M. Black, "Localization of...)

The light_beam from the lamp was filtered through a half standard thickness Corning 1840 filter .

In the eyepiece a Wratten 2 B filter was used to filter off residual ultra-violet_light .

(Ross E. McKinney and Howard Edde, "Aerated...)

Removal of the suspended solids by a membrane filter yielded an average effluent containing only 20 mg / l BOD .

[ verb ] be diffused thoroughly


"Sunlight percolated the entire house"

[ verb ] pass through


"Water permeates sand easily"

Used in print

(Glayds H. Barr, The Master of Geneva....)

A carriage crunched by , its dim lights filtering through the gloom .

[ noun ] (physics) n electrical device that alters the frequency spectrum of signals passing through it

Used in print

(Walter H. Buchsbaum, "Advances in Medical Electronics"...)

Three different wavelengths of ultraviolet_radiation are selected by the variable filters placed in_front_of the three mercury xenon lights which serve as the ultraviolet sources .

Related terms


[ verb ] run or flow slowly, as in drops or in an unsteady stream


dribble trickle


"water trickled onto the lawn from the broken hose" "reports began to dribble in"

Related terms

run leach drip