Breadcrumb Home > Dictionary > Index A Cite activated alumina: Meaning and Definition of Find definitions for: ac'tivated alu'mina Pronunciation: [key] — Chem. Chem. alumina in the form of granules having many fine pores, used to adsorb water and various gases. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. activate activated carbon TrendingHere are the facts and trivia that people are buzzing about. April 2021 Current Events: US News The Berlin Conference and the Partition of Africa The Implied Powers of Congress Noble Titles and Ranks in a Monarchy Keeping Your Brain Active in a COVID-19 World Quetzalcoatl: Aztec Myths and Myths About the Aztecs Related Content Daily Word Quiz: schadenfreude Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language