Breadcrumb Home > Dictionary > Index A Cite Abbe number: Meaning and Definition of Find definitions for: Ab'be num"ber Pronunciation: [key] ? Optics. Optics. the reciprocal of the dispersive power of a substance. Also called Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. Abbe condenser abbess TrendingHere are the facts and trivia that people are buzzing about. February 2021 Current Events: US News The Berlin Conference and the Partition of Africa The Implied Powers of Congress The Women's March on Versailles Keeping Your Brain Active in a COVID-19 World The Manchu Related Content Daily Word Quiz: syncretism Analogy of the Day: Today?s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language