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Definition of Molecular sieve
1. Noun. (chemistry) a material, usually a zeolite silicate mineral, having pores of a precise and uniform size, that can be used to separate molecules of different shape and size ¹
¹ Source: wiktionary.com
Medical Definition of Molecular sieve
1. A gel-like material with pore sizes of such ranges as to exclude molecules above certain sizes; used in fractionating or purifying macromolecules. (05 Mar 2000)