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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]