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The Collaborative International Dictionary
Filtrating

Filtrate \Fil"trate\, 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.

Wiktionary
filtrating

vb. (present participle of filtrate English)