activated alumina

American

noun

Chemistry.

alumina in the form of granules having many fine pores, used to adsorb water and various gases.

activated alumina British

noun

a granular highly porous and adsorptive form of aluminium oxide, used for drying gases and as an oil-filtering material and catalyst

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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activated alumina

The activated alumina helps them get within the legal limit, but fluoride levels there are still far higher than most other communities in the U.S.

From Salon ● May 7, 2024

Reverse-osmosis filters and carbon filters with activated alumina remove most of the fluoride, but water softeners and charcoal or carbon filters do not.

From New York Times ● Jan. 23, 2012

Mr. Davis thought of an aluminum holder with a filter of activated alumina, an absorbent much used in chemistry.

From Time Magazine Archive

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023