sieve

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sieve

(siv),
A meshed or perforated device for separating fine particles from coarser ones.
[O.E. sive]

sieve

A slang term for an A&E/ER doctor who admits almost every patient he or she sees to hospital.

sieve

(sĭv)
A device consisting of a mesh with holes of uniform size. It is used to separate particles above a certain size from solutions or powders.

molecular sieve

A type of sieve in which the molecular material present in the gel or crystal will adsorb molecules of a certain kind and let others pass.