n. [ F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See Feuter. ] 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. [ 1913 Webster ]

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; -- called also infiltration gallery. [ 1913 Webster ]

v. t. [ imp. & p. p. Filtered p. pr. & vb. n. Filtering ] [ Cf. F. filter. See Filter, n., and cf. Filtrate. ] To purify or defecate, as water or other liquid, by causing it to pass through a filter. [ 1913 Webster ]

Filtering paper, or
Filter paper, a porous unsized paper, for filtering. [ 1913 Webster ]

v. i. To pass through a filter; to percolate. [ 1913 Webster ]

n. Same as Philter. [ 1913 Webster ]

adj. having a tip designed to filter the smoke; -- of a cigarette or cigar; as, filter-tipped cigarettes. [ WordNet 1.5 +PJC ]

n. [ OE. filthe, fulðe, AS. f&ymacr_;lð, fr. fūl foul; akin to OHG. fūlida. See Foul, and cf. File. ] 1. Foul matter; anything that soils or defiles; dirt; nastiness. [ 1913 Webster ]

2. Anything that sullies or defiles the moral character; corruption; pollution. [ 1913 Webster ]

To purify the soul from the dross and filth of sensual delights. Tillotson. [ 1913 Webster ]

Filth disease (Med.), a disease supposed to be due to pollution of the soil or water. [ 1913 Webster ]

adv. In a filthy manner; foully. [ 1913 Webster ]

n. 1. The state of being filthy. [ 1913 Webster ]

Let us cleanse ourselves from all filthiness of the flesh and spirit. 2 Cor. vii. 1. [ 1913 Webster ]

2. That which is filthy, or makes filthy; foulness; nastiness; corruption; pollution; impurity. [ 1913 Webster ]

Carry forth the filthiness out of the holy place. 2 Chron. xxix. 5. [ 1913 Webster ]

a. [ Compar. Filthier superl. Filthiest. ] Defiled with filth, whether material or moral; nasty; dirty; polluted; foul; impure; obscene. “In the filthy-mantled pool.” Shak. [ 1913 Webster ]

He which is filthy let him be filthy still. Rev. xxii. 11.

Syn. -- Nasty; foul; dirty; squalid; unclean; sluttish; gross; vulgar; licentious. See Nasty. [ 1913 Webster ]

v. t. [ imp. & p. p. Filtrated p. pr. & vb. n. Filtrating. [ Cf. LL. filtrare. See Filter. ] To filter; to defecate; as liquid, by straining or percolation. Arbuthnot. [ 1913 Webster ]