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The Collaborative International Dictionary of English v.0.48 (gcide)

Filter \Fil"ter\, 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]