The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Filtrate \Fil"trate\, n.
   That which has been filtered; the liquid which has passed
   through the filter in the process of filtration. Contrasted
   with retentate, the material remaining on the filter.
   [1913 Webster]

WordNet (r) 3.0 (2006):

filtrate
    n 1: the product of filtration; a gas or liquid that has been
         passed through a filter
    v 1: remove by passing through a filter; "filter out the
         impurities" [syn: filter, filtrate, strain, separate
         out, filter out]