1. (n.) Any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may passed to cleanse it from the solid or impure matter held in suspension; a chamber or device containing such substance; a strainer; also, a similar device for purifying air.

2. (n.) To purify or defecate, as water or other liquid, by causing it to pass through a filter.

3. (v. i.) To pass through a filter; to percolate.

4. (n.) Same as Philter.

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