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r device containing such substance; a strainer; also, a similar device for purifying air. Filter bed, a pond, the bottom of which is a filter composed of sand gravel. -- Filter gallery, an underground gallery or tunnel, alongside of a stream, to collect the water that filters through the intervening sand and gravel; -…

A filter, as for sugar, in which a cylinder with a porous or foraminous periphery is rapidly rotated so as to drive off liquid by centrifugal action.

To filter or sift in.

n close vessels; -- called also animal charcoal. It is used as a decolorizing material in filtering sirups, extracts, etc., and as a black pigment. See Ivory black, under Black. -- Bone cave, a cave in which are found bones of extinct or recent animals, mingled sometimes with the works and bones of man. Am. Cyc. -- B…

al charcoal, a fine charcoal prepared by calcining bones in a closed vessel; -- used as a filtering agent in sugar refining, and as an absorbent and disinfectant. -- Charcoal blacks, the black pigment, consisting of burnt ivory, bone, cock, peach stones, and other substances. -- Charcoal drawing (Fine Arts), a drawin…

To clarify by filtering through clay, as sugar.

The act or process of straining or filtering. [R.]

A cake yeast made by filtering the cells from the liquid in which they are grown, subjecting to heavy pressure, and mixing with starch or flour.

To filter. Salt water, drained through twenty vessels of earth, hath become fresh. Bacon.

To filter; to defecate; as liquid, by straining or percolation. Arbuthnot.

The act or process of filtering; the mechanical separation of a liquid from the undissolved particles floating in it.

To enter by penetrating the pores or interstices of a substance; to filter into or through something. The water infiltrates through the porous rock. Addison.

cavities. Kirwan. Fatty infiltration. (Med.) See under Fatty. -- Infiltration gallery, a filter gallery.

A contrivance to filter, as air, in order to protect the lungs from inhaling damp or cold air, noxious gases, dust, etc.; also, the respiratory apparatus for divers.

To cause to pass through fine interstices, as a liquor; to filter; to strain. Sir M. Hale.

The act or process of percolating, or filtering; filtration; straining. Specifically (Pharm.), the process of exhausting the virtues of a powdered drug by letting a liquid filter slowly through it.

One who, or that which, filters. "[Tissues] act as percolators." Henfrey.

A filtering machine operated by air pressure.

A filter containing the above refuse, used in clarifying and perfecting malt, vinegar, etc. Rape wine, a poor, thin wine made from the last dregs of pressed grapes.

rous substance; to purify, or separate from extraneous or solid matter, by filtration; to filter; as, to strain milk through cloth. To strain a point, to make a special effort; especially, to do a degree of violence to some principle or to one's own feelings. -- To strain courtesy, to go beyond what courtesy requires;…