A strainer; a piece of woolen cloth, paper or other substance, through which liquors are passed for defecation. A filter may be made in the form of a hollow inverted cone, or by a twist of thread or yarn, being wetted and one end put in the liquor and the other suffered to hand out below the surface of the liquor. Porous stone is often used as a filter.

To purify or defecate liquor, by passing it through a filter, or causing it to pass through a porous substance that retains any feculent matter.

To percolate; to pass through a filter.