molecular sieve

noun

Chemistry.

1. a compound with molecule-size pores, as some sodium aluminum silicates, that chemically locks molecules in them: used in purification and separation processes.

molecular sieve

noun

1. chem a material that can absorb large amounts of certain compounds while not absorbing others and is thus suitable for use in separating mixtures

Word History and Origins

Origin of molecular sieve¹

First recorded in 1925–30

Example Sentences

Concentrators pull oxygen out of ambient air by forcing it under pressure through a “molecular sieve” filled with the mineral zeolite, which adsorbs nitrogen.

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