The Collaborative International Dictionary of English v.0.48:

Cribration \Cri*bra"tion\ (kr?-br?"sh?n), n. [Cf. F. cribration,
   fr. L. cribrare to sift. See Cribble, n.] (Pharmacy)
   The act or process of separating the finer parts of drugs
   from the coarser by sifting.
   [1913 Webster]