n. A device for arresting and separating any matter mechanically suspended in a liquid.n. Specifically In fish-culture, a long box in which screens, usually of flannel, are placed, through which the water is filtered before it passes into the hatching-troughs. Also called filtering-box, filtering-tank.To purify or defecate, as water or other liquid, by passing it through a filter or any cleansing medium; strain.Specifically In analytic chemistry, to separate (a solution) from the solid matter contained in it, either for the purpose of collecting and saving the solid matter, usually a precipitate, or of preparing the solution for further operations.To percolate; pass through or as through a filter.Same as felter.n. See philter.