Akademik

sieve
A meshed or perforated device for separating fine particles from coarser ones. [O.E. sive]
- molecular s. a gel-like material with pore sizes of such ranges as to exclude molecules above certain sizes; used in fractionating or purifying macromolecules.

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(siv) a device having pores or perforations of uniform size used for separating objects or particles of different sizes.

Medical dictionary. 2011.