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Webster 1913 Edition

Filter

Fil′ter

,
Noun.
[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.
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
.

Fil′ter

,
Verb.
T.
[
imp. & p. p.
Filtered
;
p. pr. & vb. n.
Filtering
]
[Cf. F.
filter
. See
Filter
,
Noun.
, and cf.
Filtrate
.]
To purify or defecate, as water or other liquid, by causing it to pass through a filter.
Filtering paper
, or
Filter paper
,
a porous unsized paper, for filtering.

Fil′ter

,
Verb.
I.
To pass through a filter; to percolate.

Fil′ter

,
Noun.
Same as
Philter
.

Webster 1828 Edition

Filter

FIL'TER

, n.
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.

FIL'TER

,
Verb.
T.
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.

FIL'TER

,
Verb.
I.
To percolate; to pass through a filter.

FIL'TER

,
Noun.
[See Philter.]

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